The comma. It's the difference between "helping your uncle Jack off a donkey, and helping your uncle Jack, off a donkey." 
Seriously though, I didn't know crohns made you have to wear a colostomy bag. Didn't David Garrard just have some of his intestines taken out?
It doesnt by default.
I have a good buddy that has crohns, he has it really mild, horrid gas only, he has goes outside to fart because its beyond foul.
I dated a girl with crohns for a couple weeks, we went on a quick weekend getaway to malibu once, I felt bad for her because she has to get up to use the bathroom like 3 times a night, probably horrifyingly embarrassing for her. I heard it too, it was brutal. she turned on the bathtub in the hotel to try and kill the sound, but it still sounded like a nuclear reactor fouling up in the bathroom haha. Cant make this shit up.