Moishe Epstein is a simple factory worker. He approaches his boss to discuss a discrepancy in his paycheck.
“Excuse me sir,” says Moishe. “This is $100 less than my regular salary.”
“I know,” says his boss. “But last month, you were overpaid $100, by mistake, and you didn’t complain!”
“Well,” explains Moishe “I don’t mind an occasional mistake, sir, but I don’t want you to start making it a habit!”