I never listen to my friends at con time when it comes to eating. Ever, it seems.
At Sakuracon 2011, I was constantly pressured into eating by my cousin, my two friends, and my uncle whom I was at the convention with. I can't really think of a single time I ate that entire convention. I payed for it when I got home since I became really ill and ended up missing quite a few day's of school.
I can't really call that a "horror" story, but it still seems that I don't eat well at conventions. It's either junk food or nothing at all. Maybe it's a horror story since I never seem to learn my lesson. Haha.
"Life's all about figuring out how dumb you can be!" -Lupin III