Per the food/chocolate discussion upthread, I got the X today because of chocolate in DTW. I figured it was dairy, and may have nuts, so I clicked yes. They were great about rushing me through, and told me I got X'd 'cause of that answer. They weren't really sure that chocolate counted as food, but I guess I'll check that every time just to stay within the rules.

I always bring chocolate back from Europe, so I guess I'll be seeing a lot of X's.