1. Accidentally biting your tounge or cheek whilst eating
2. headaches
3. foot cramps

I guess biting your tounge and/or cheek accidentally hurts a lot because it's unexpected and because when you're eating, you don't think about "ooh, I'd better not chew so hard, I might bite my tounge," so you bite hard in order to grind everything up properly and next thing you know, you're writhing in pain.

Headaches can be as simple as a small pang to being all over in your head. I occasionally get the ones that really smart-sharp pangs in the nose that feel like someone's repeatedly stabbing you with a needle and that is EXTREMELY PAINFUL.

Foot cramps are just plain miserable because it's a pinching sensation that doesn't go away for a while so you're sitting there trying to heal it. I get sooo aggrevated by these!