http://tags.lifehacker.com/assets/base/img/thumbs140x140/io9.com.png http://io9.com/tag/humanspunchingaliens http://io9.com/tag/humanspunchingaliens 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.

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