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?

'Ace Ventura: Pet Detective' (1994) – "Your gun is digging into my hip."
In Jim Carrey's breakout role, his character unknowingly kisses a man named Lt. Einhorn. To his credit, this dude really did look like a lady -- and is even played by actress Sean Young. After the kiss Ventura says, "Your gun is digging into my hip," a line still frequently quoted by Carrey fans. When Ace learns that Einhorn is a man and realizes that that wasn't a gun digging into his hip, he goes through his own personal 'Crying Game.'



'Austin Powers : International Man of Mystery'
(1997) – Dr. Evil's Rocket

Much of the humor in the 'Austin Powers' series is either genitalia-based or involves sexual innuendo. This particular scene truly took things to the next level and arguably set the boner-humor bar too high for the 'AP' sequels to touch. When Dr. Evil finally unveils his rocket, it is shaped like an erect phallus, allowing the screenwriters to trot out a million puns for a man's package.



'There's Something About Mary' (1998) – The Zipper Incident
Perhaps the best boner joke ever committed to celluloid is actually a "false-boner" gag. Leave it to the Farrelly Brothers to take masturbation humor to new gross-out levels. Ben Stiller's character, Ted, a nerdy teen brace-face, gets unbelievably lucky and scores a prom-date with gorgeous Mary (Cameron Diaz). While picking her up, he stops to use the restroom and accidently catches a glance of Mary changing. Worried about what she and her mom now think even though he is merely urinating, he quickly zips up and gets his manhood caught in his fly. As Ted is carted off in the ambulance, Warren, Mary's mentally-challenged brother, announces to the neighborhood that he did it while masturbating.



'Anchorman: The Legend of Ron Burgundy'
(2004) – A "Massive Erection"

It's fitting that three of today's most successful men in comedy (Will Ferrell, Adam McKay and Judd Apatow) were all involved in bringing us one of the best, and longest, boner jokes. Ron Burgundy (Ferrell) is successfully asking out Veronica Corningstone (Christina Applegate) on a date that is not supposed to be "a date." All seems to be going well until the camera pans out and we notice he has a "massive erection." In true Ferrell form, Burgundy has no self-awareness and only makes things more awkward when Corningstone points it out.



'The 40-Year Old Virgin' (2005) - Morning Wood
Let's be honest, boner jokes hit hardest with guys. Women think boners are funny (when they're not totally aroused by them), but guys relate best to the absurdity of dealing with erections on a daily basis. That is why the opening scene in 'The 40-Year-Old Virgin' hits home for men. It's a case of "it's funny because it's true." Andy Stitzer (Steve Carrell) wakes up and has to do the difficult task of urinating with morning wood, an uncomfortable situation all teenage boys deal with on a weekly basis. Since Andy has the sexual experience of an adolescent, this action grounds the movie's absurd premise. Did you ever think a boner joke would "ground" a film? That is why Judd Apatow is a comedic genius.



'The Hangover' (2009) - End Credits
The Motion Picture Association of America allows directors to show a penis on film and still receive an R rating. This is displayed earlier in 'The Hangover' when Mr. Chow (Ken Jeong) jumps from the car trunk completely naked and kicks butt. However, the penis has to be flaccid, otherwise the movie gets the dreaded NC-17 rating. Director Todd Phillips got around this by giving Zach Galifianakis a strap-on. When audiences watched the drunken night's photos during the final credits, the were convinced they saw the bearded actor's actual boner. In case you hadn't already guessed, the following video is NSFW.