This happens to me too. I spend all my cash on buds, then have a dollar or so left for munchies. It's really sad til I get home and munch on everything that is edible in my house.
i don't remember what i got, but i spent $21 at Taco Bell by myself, took it home, and consumed it as i watched Lord of the Rings. i then had a massive shit... i remember that part.