Because sometime after midnight, people start getting silly and conversations go like this:
SAMUEL: I'm dead. I'm in purgatory, so you guys have to give me a penance.
ME: So you can get out of purgatory and go to heaven?
SHAWN: Hmm, well, you could skip lunch tomorrow.
SAMUEL: Skip lunch? But I'll DIE.
ME: I thought you were already dead. You're in purgatory, remember?
SAMUEL: Oh. Right.