Three people split a bill at Applebee's for $30. They each pay $10 each, leave the table, and start walking towards the exit. Before they could exit the restaurant, the waiter comes back and exclaims he was only supposed to charge them $25. The waiter comes back with $5. Each of the three people keep one dollar and gives the waiter the other $2, as they can't share it. So now each of the people paid $9 (totaling $27) and the waiter has $2. Where did the extra dollar go?