My wife was a teller at a bank in the United States. She had a regular customer that came in one day with a note that said he had a bomb and she needed to give him all of her money.
She laughed at him at first because she didn't think he was serious. She eventually looked at the expression on his face and realized that he was indeed very serious. She gave him the money that was in her drawer and as soon as he left she let her supervisor know what had happened.
She was very shaken and her boss ended up giving her the day off after she had done the interviews with the authorities. Luckily because the person was a regular visitor of the bank she could tell the police exactly who it was and they caught him shortly thereafter.
That evening she want to the bar to unwind and her friend who also worked at the bank with her had the DJ play "You dropped a bomb on me".