Apparently, Microsoft did not perform enough edge case testing on their Santa bot for Windows Live Messenger. This link points to the story. It seems Santa is capable of discussing rather naughty topics and using language that is not what you want your kids exposed to.
This just points out how software ends up getting used in ways that the programmers never envision. By the way, Microsoft has removed the Santa bot and I am certain he will be put through the testing ringer before (if) he makes a future appearance.