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?
Little Fockers
PG-132010
Based on 32 critics

Greg Focker's moonlighting with a drug company threatens his father-in-law's trust in him. Read More

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

A 1970s newsman (Will Ferrell) feels threatened by a female employee (Christina Applegate). Read More

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

Three co-workers unite to help their buddy's (Steve Carell) sex life. Read More

There's Something About Mary
R1998
Based on 29 critics

A remarkable woman (Cameron Diaz) attracts assorted admirers (Matt Dillon, Ben Stiller). Read More

The Hangover
R2009
Based on 31 critics

After a wild stag party, three groomsmen must find their missing pal before his wedding. Read More

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

Two cryogenically preserved foes, a hip British agent and his '60s nemesis, face off in the '90s. Read More

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

The goofy sleuth (Jim Carrey) sets out to find the Miami Dolphins' missing mascot, Snowflake. Read More