Once, in the centre of a medium-sized town, a group of local dignitaries assembled for supper in a smart restaurant. A waiter came over to them. "You know, gentlemen, I'm a Wikipedia editor. None of you has an article on Wikipedia yet so I'll write them this evening."
The distinguished gentlemen all smiled politely. "As long as it's not libellous," joked one.
They didn't see the waiter again for about three hours. When he returned, he said "All done on Wikipedia, gentlemen. And, not that it matters, but which of you didn't want his article to be libellous?"