This one was pretty obvious. Apart from X-rated films, how many movies featuring semen can hold a candle to the scene in There's Something About Mary where Ben Stiller "preps" for his date, only to have Cameron Diaz mistake his self-induced excretion for hair gel. It's one of the most recognizable moments in movie history, and in my opinion is the finest comedic use of bodily fluids in cinema history. Ok, those are some of my favorite uses of bodily fluids in film history. There are PLENTY of other bodily fluids used in movies, so let me hear which ones I missed.