There's a stage magician who has been setting up in the Public Garden across from the ducklings. I haven't had time to watch his act, but he seems popular.
The other day, he was between acts; I think he was setting up for the next round, so there were just a few kids and parents watching him. I'm not sure what happened, but he jumped back from his table and dropped the S-bomb in front of six or seven six- or seven-year-olds.
I don't consider myself particularly prudish, but it does seem that if one is gearing one's act towards small children, one should have an emergency backup supply of not-quite-swear words for such situations.