Sure, we come in peace and all that. But sometimes, when we encounter alien life forms, the only way we can communicate is by using our built-in universal translators: the ones with five knuckles and a thumb. Here's our compilation of the greatest scenes from movies and TV where a human socks an alien. (To the tune of "Mama Said Knock You Out" by LL Cool J.) Thanks to Lauren Davis for all the research help.
Send an email to Charlie Jane Anders, the author of this post, at charliejane@io9.com.











