Well, I can tell you what I did one time--my sister and her family had came down from VA. to visit me for a weekend. We all got together and went to a high end restaurant.While my sister was in the bathroom, I told the waitress that it was her birthday. (It wasn't.) So, after our meal, here come about 12 waitresses with a piece of cake and all of them were singing and clapping! Everybody at the table, including all the kids just cracked up! She leaned over and told me she was going to kill me...she knew I was behind it! She was a good sport though. I tipped the waitress extra. I told her it really wasn't her birthday. She laughed too!