We've tried to stay away from sounds made by an actual character, like Soundwave's awesome voice from The Transformers, or Darth Vader's breathing from Star Wars. Note: click on the name to hear the sound effect.

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• Spaceships in the 1950s: Back in the heady days of early science fiction movies, the Theremin (probably one of the coolest instruments ever invented) would provide the "Ooooh-EEEEE-oooooh" sounds of spaceships flitting about in the sky and other spooky paranormal sounds. It tended to be overused, and instantly became identifiable with cheesy scifi. If we ever get our own office Theremin, this is the first sound we'd ever make on it.
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• The Alien Heat Ray from War of the Worlds: In the original 1953 movie, the alien heat ray has an awesome cycling sound buried within the sound of the beam. We hope a real heat ray blast sounds this way some day — and we may have found our new cell phone ringtone.
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• The Alien Probe from War of the Worlds: This terrifying sound is one of those things you'd imagine from under the covers as a kid. Nothing is more "wet the bed" inducing than a good, scary scifi sound effect. Cursed alien probes.
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• The automatic doors from Star Trek: These doors were one of the most iconic sounds from The Original Series, and were even parodied by Shatner himself in Airplane II.
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• The communicating whistles and doorbells of Star Trek: The Original Series and Star Trek: The Next Generation: While the old Star Trek communicator used to make a sort of wolf-whistle sound at you, the doorbells on The Next Generation were crisp and punctual. How many people out there are using these as ringtones today?
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• The transporter beam from Star Trek: Besides the doors, this was another one of the sounds most identified with Star Trek. The original beaming sound is a bit dated, but still retro cool and... long. It took so much time for them to appear that you wonder why their enemies were ever caught off guard.
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• The Bionic sounds of The Six Million Dollar Man: Whether he was using his bionic strength to toss a tree out of the way, spy on folks with his bionic peeper, or jumping over something with smooth Wonder Woman-esque bionic legs, Colonel Steve Austin cornered the market on iconic sound effects. Even though it's cheesy, we still love this sound.
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• The lightsaber from Star Wars: Even above blasting lasers and beeping droids, the lightsaber is the most identifiable sound to come out of the Star Wars universe. In fact, you've probably used a flashlight to make a lightsaber in the smoke from your campfire, and made these same noises with your mouth, admit it.
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• A TIE Fighter passing by from Star Wars: For some reason, the wailing sound of a TIE Fighter was much cooler than the whining engine sound of an X-Wing, or the "whoomph" sound effect of the Millennium Falcon. It still sounds very alien, and creepy cool.
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• This video shows off the Top 10 sound effects from Star Wars, but half of them are character based, which we've stayed away from in this post, i.e. Darth Vader's breathing, R2-D2's beeping and booping, etc. However, those seismic charges were admittedly pretty damn cool, and just check out the lightsaber montage at the end.
  
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• The Cylon Eye from Battlestar Galactica: Probably the most iconic sound from Battlestar Galactica, the 70s edition was the scanning sound of the Cylon eye. My brother and I used to hide behind the couch when they'd come onscreen and talk in their awesome vocoder voices.
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• The DRADIS from Battlestar Galactica: In the new series, they spend so much time staring at this thing that the sound becomes embedded in your head. Of course, it does tell them if something is about to vaporize their ass, so we can understand why.
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• K.I.T.T.'s scanner eye from Knight Rider: Owing a lot to those cyclops-esque Cylon eyes was the scanner that both signified that K.I.T.T.'s scanner was active, and also served as his "heartbeat."
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• The TARDIS taking off and landing from Doctor Who: The TARDIS had several sound effects: the whirring of the doors, the hum of the control room, the flying through space sound... but the most popular noise that endures to this day was the sound of it materializing and dematerializing. If you pick up this Electronic Flight Control Tardis, you can have them all at your fingertips on your desktop.
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• The Sonic Screwdriver from Doctor Who: The Doctor's multi-purpose tool that seems to be able to do just about anything has its own sound, and it's changed a bit over the years. In fact, you can pick up your very own sonic screwdriver, complete with sound effects. Just don't complain when it fails to make money spew out of the ATM machine.
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• The transforming sound from Transformers: Whenever Optimus Prime, Megatron, Jazz, or Soundwave would transform into their alter-egos, this sound accompanied them, and buried itself in the brains of billions of kids around the world. It still makes me think I can turn into something different whenever I hear it.
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• The Wonder Twin Powers, Activating, from The Superfriends: Okay, we're breaking our own rule with this one, since it's character based, but we just love the cheesy music/SFX behind Zan and Jayna activating their lame superpowers. They really need their own campy show these days.
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• The sound was originally recorded in 1931 for Frankenstein, and it quickly became a staple for haunted houses, spooky castles, and impending bad weather on film soundtracks everywhere.
• Originally recorded on optical film stock, most modern day version are 15th generation (or older) copies, meaning you can no longer hear the original crackles and pops that are apparent on the original.
• The sound was featured in Star Wars, courtesy of Ben Burtt again, and can be heard during the trench run sequence on the Death Star.
• The most famous science fiction use of the sound (besides Frankenstein) was probably when the Delorean was struck by lightning in Back to the Future. In fact, we're surprised they don't use that sound effect when anything gets struck by lightning. It's just so perfect. Maybe because I can't get it out of my head right now.
• Other science fiction films that latched on the Castle Thunder were: Ghostbusters, Twilight Zone: The Movie, Big Trouble in Little China (okay, we know this is fantasy... but c'mon), Short Circuit, The Land Before Time, The Monster Squad, and of course Mel Brooks' Young Frankenstein.
• The sound can be heard multiple times every day inside The Haunted Mansion as both Disneyland and Disney World, most famously in the stretching room when the host suggest a "way out." Cue the thunder and screams.
• The sound effect was a favorite on Scooby Doo, and could be heard during the opening credits. However, they later "retired" the sound from the show in 1988 to make way for digitally recorded thunderclaps. The bastards.
• However, it's still featured prominently in the opening to Aqua Teen Hunger Force, so there is still some cartoon love for the sound going on out there.
• For my money, the best usage of the sound was in the opening sequence to Dr. Shrinker, which was part of the Krofft Supershow. One day I'll devote an entire triviagasm to this show, trust me.

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• The first appearance of the scream was in 1951's Distant Drums, and was used when a man was eaten by an alligator.
• The sound is named the "Wilhelm Scream" after Pvt. Wilhelm gets shot in the leg by an arrow in the 1953 film The Charge at Feather River, and screams as he falls over.
• The sound was used in eight more films in the 1950s, including 1954's Them!, about giant, nuclear-mutated ants.
• The sound persisted into the 1960s, appearing in eight more movies, including the campy Hercules Against The Moon Men, where Hercules battles monsters from the moon.
• While Wilhelm started to flag in the 1970s, Star Wars sound designer Ben Burtt found a reel labeled "Man Being Eaten By Alligator" in the Warner archives and used the sound when Luke shoots a Stormtrooper who falls down a shaft in the Death Star.
• Burtt later tracked the sound back to its original use in Distant Drums, although he was the first to call it the "Wilhelm Scream."
• The sound has since been featured in every Star Wars and Indiana Jones movie. In fact, it was even used in The Star Wars Holiday Special.
• It's a mystery as to who the actor was that recorded the original scream, but the most likely suspect is character actor and singer Sheb Wooley, whose name appeared on a memo as a sound extra for Distant Drums. He's best known for his hit song "The Flying Purple People Eater".
• The sound has been used in over 75 movies (most recently in Cloverfield), dozens of television shows (like Doctor Who), and even numerous video games... including many of the Star Wars titles.