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?
There's Something About Mary Movie Poster
There's Something About Mary
R1998
Based on 29 critics

Ted's (Ben Stiller) dream prom date with Mary (Cameron Diaz) never happens due to an embarrassing injury... Read More

Austin Powers: International Man of Mystery Movie Poster
Austin Powers: International Man of Mystery
PG-131997
Based on 25 critics

A world-class playboy and part-time special agent, Powers is defrosted after 30 years in a cryogenic... Read More

Ace Ventura: Pet Detective Movie Poster
Ace Ventura: Pet Detective
PG-131994
Based on 14 critics

When the dolphin mascot of Miami's NFL team is abducted, Ace Ventura (Jim Carrey), a zany private investigator... Read More

Anchorman: The Legend of Ron Burgundy Movie Poster
Anchorman: The Legend of Ron Burgundy
PG-132004
Based on 38 critics

Hotshot television anchorman Ron Burgundy (Will Ferrell) welcomes upstart reporter Veronica Corningstone... Read More

The 40-Year-Old Virgin Movie Poster
The 40-Year-Old Virgin
R2005
Based on 35 critics

Andy Stitzer (Steve Carell) is an amiable single guy who works at a big-box store. Living alone, 40-year-old... Read More

The Hangover Movie Poster
The Hangover
R2009
Based on 31 critics

Two days before his wedding, Doug (Justin Bartha) and three friends (Bradley Cooper, Ed Helms, Zach Galifianakis)... Read More

Little Fockers Movie Poster
Little Fockers
PG-132010
Based on 32 critics

After 10 years of marriage and two children, it seems that Greg Focker (Ben Stiller) has finally earned... Read More