If Im eating goldfish (The snack, not the fish), or anything like that, I have to put one on each side of my mouth before I eat them. Or with like M and M's I eat them in their colored pairs- one on each side. It gets me pissed when I don't have an even amount of colors/ pairs and then I have to bite them in half. lol
Oh and I have to use up all the ketchup or BBQ sauce or whatever that I put on my plate for dipping in.. It bothers me if I don't use all of it lol