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• C.H.U.D.: This is probably one of the best known sewer monster movies, which is what happens when you bury nuclear waste under New York City. Luckily, a cop, a reporter, his girlfriend, and a street bum band together to fight it. And if you've always wondered what it stood for, you can quit: "Cannibalistic Humanoid Underground Dweller". But wait a minute, one of the containers in the film also says "Contamination Hazard Urban Disposal" on it. Thanks for making it confusing filmmakers. It's also the name of a movie website, where it stands for "Cinematic Happenings Under Development," and they've lovingly named their message boards the "Sewer Chewer".
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• The Blob: In the 1988 remake of the Steve McQueen classic, a meteorite falls to Earth that contains a strange visitor who looks like, well... a blob of jelly. It soon starts attacking people and then retreats into the sewer system, where it can roam free and wreak havoc. (In the original film, it doesn't make use of the sewers for some reason). Written by Frank Darabont, and starring Kevin Dillion, it faded quickly into the bad remake file.
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• Them: In this 1954 film, radiation causes ants to grow to enormous size and seek out somewhere homey to set up a new nest. Namely, the Los Angeles sewer system. The ending of the film promises future atomic horrors, and it went on to become Warner Bros highest grossing film for that year. Apparently mutated ants + the sewer = big money.
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• Weird Science: While it didn't exactly come directly from the sewers, Lisa uses her science-magic powers to turn Wyatt's annoying older brother Chet into a shit monster. Literally. He becomes gross ball of farting poop until he finally apologizes to Wyatt and Lisa de-mutates him at the end.
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• Dogma: In Kevin Smith's religious comedy, the Golgothan is the excrement monster that Jason Lee sends after Jay and Silent Bob. He's made up of all the evil shit from all over the world, and even has his own action figure that farts when you squeeze it. Unlike the Charmin.
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• Monsturd: We shit you not (sorry), this is the actual title of this 2003 direct to video gem. A serial killer escapes from jail and gets chased into the sewers, where he falls into a pool of chemicals. As you'd expect, the chemicals transform him into a half-human, half-poop monster who goes on a killing spree.

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• In Lexx, the living spaceship was also equipped with... living toilets. They even had large, waggling tongues, a la Little Shop of Horrors, and were more than eager to lap up the crew's waste materials. That would either make going to the bathroom incredibly fun, or moderately terrifying. Think you can hold it for 42,000,000 miles? You could if the toilet looked like it wanted to eat your ass.
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• Lexx wasn't the only living spaceship with bathroom facilities. Moya in Farscape also grew convenience spots for her crew, including showers and toilets. In fact, the water system was provided by Moya's own internal plumbing system, which her saliva powered the sewer system. That just seems like all kinds of "two girls, one cup" wrong.
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• In the future of Demolition Man, Sylvester Stallone was perplexed by the futuristic toilets. The bowls looked the same, but as far as waste management went, there were three mysterious "seashells" next to the toilet that he never quite figured out. We never figured it out either, and we'll chalk it up to extremely lazy writers who didn't feel the need to explain how they wiped their asses in the future, so now we'll forever be wondering what those damn shells did.
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• Stanley Kubrick's 2001: A Space Odyssey was so detailed that the Zero Gravity Toilet installed on the passenger ship to the moon including verbose instructions on how to use the waste facilities. Although if you really had to go, we can't imagine anyone taking the time to actually read through all of these steps before stepping inside. Wouldn't you print something like this where you could easily read it while doing your duty? The only way this could be worse would be if they just handed you a 200 page manual as you went in.
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• Onboard the Serenity in Firefly, living space is at a premium, so they've got toilets that fold neatly into the wall and flush as they go. Then you pull out the sink like a drawer and wash your hands, although preferably using soap. In the clip below, Captain Mal Reynolds takes a whiz and then simply WETS HIS HANDS DOWN THE WATER then puts them on his face. Meaning he's just coated his cheeks in penis germs. No wonder he hasn't scored with Inara just yet.
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With apologies to Kathleen Meyer's How To Shit In The Woods.