My flatmate ate a whole chili not so long ago, and didn't think anything of it, I was completely shocked,
It depends on what chilli he ate. They vary from quite mild to devlishly hot.

Actually, drinking water only increases the pain.
I've heard salt is a better cure, although that sounds weird.
Ive never heard as salt as a cure. Personally, I drink hot/warm water. It makes your mouth burn for a second and then the heat just seems to disappear.

I kind of like to prove myself in different "challenges" of this kind, so I would probably try the spiciest food I could find.
I'm pretty crazy every now and then.
LOL. Have you ever entered a chilli eating contest? If you havnt you should.