Polite Robbers

Patty, the bank teller, was having a bad day with nasty and rude customers. A nicely dressed young man came up to her window and with a smile showed her a note. "Please give me all your money... I thank you for your time and help!" After emptying her drawer into a bag, she added a chocolate bar left from her lunch. "What's that for?" he asked. "That's because you were the most polite person I've had all day," she answered.