I have three roomates. One is a gigantic pig. When I first moved in, I assumed this would be the guy that'd be stealing all my food.
He's the kind of guy that'll order two pizzas, a box of wings, a box of boneless wings, and a 2L pop (on a regular basis, like 2-3 times a week, I might add). He'll finish off most of the wings, a pizza, and the pop. The odd part is, he'll put the rest in the fridge and never touch it again. He refuses to eat leftovers of any kind.
Once I learnt his habits, I also quickly learnt that this is the best kind of roommate to have. Free pizza with no guilt!
Except for the guilt of eating calorie-laden pizza multiple times a week... I quickly put on a freshman 15 when I moved in... damn him.