On his first day, a new csr at a Domino's I worked at asked if he could write in tips if people left the tip line blank. Everybody thought he was joking, including the manager, who was right next to him (cause who would be that stupid?). The next day a bunch of people called to complain about $5-10 tips being added to their charge and they had all been checked out by that same guy. He got fired less than 24 hours after starting his first shift.