He lifts his hand just as the waiter approaches, and so the guy passes the check to Luke. “Oh no,” Dad says. “It’s always my treat.” “It’s already taken care of,” Luke says, flipping open the wallet to add a tip to the receipt and sign the bill. “You saved my finance grade, and I’m grateful.” He must have slipped a credit card to the waiter when he went to the men’s room. Sneaky. Dad beams at this bit of trickery. He doesn’t care about the money, but I can tell that Luke has impressed him. Isn’t that hilarious? We’re both a little obsessed.