There's very few films I've turned off part way through. I normally like to see them through to the end regardless, However it was at this point I turned off Van Wilder. I'm no prude, a bit of 'gross-out' comedy is perfectly acceptable to me - American Pie is one of my favourite comedy films. However this was one step too far, and completely unnecessary, even within the context of a 'gross-out' film.
To be honest I'm not sure I can think of anything else worse than this.