We may not agree on the origin of man, but it's a safe bet that our ancestors, whoever they might have been, laughed whenever one of their menfolk got hit in the nuts.

That's because comedy relating to a man's crotch is humor without borders; age, language, nationality, creed, sex and social class don't seem to matter. Indeed, jokes involving a gent's junk unite us all in laughter, and that may be why they've long been a go-to gag on the big screen.

This is proven yet again in the new movie 'Little Fockers,' yet another Ben Stiller/Robert De Niro team-up. A subplot has De Niro's character taking Sustengo, a Viagra knockoff, and it gives him a pesky, four-hour boner. And guess which family member has to deal with it? His son-in-law, of course.

The surely hilarious bit offers us a small window to take a fond look back at some famous boner jokes in film history -- and that's a window we're going to leap through head-first. We've listed our six favorites below. Did we miss any?
categories Features, New Releases