For some decades now, people haven't wanted to swim in ordinary public swimming pools; they want to swim, play, and relax in a so-called subtropical swimming paradise. So several of these paradises have been built in the Netherlands. One of the main attractions is the waterslide: a pipe with curves inside and outside the building, ending up in a pool. In the late 1970s a brand new subtropical swimming paradise was to be opened. As an opening ritual, the young daughter of the mayor would come down the waterslide. Nobody knew that the night before some vandals had hammered several nalls through the bottom of the waterslide, in a curve outside the building. Since no one had bothered to make a last inspection, the daughter of the mayor came down heavily mutilated, screaming and bleeding. At least, that's what I read in the local newspaper, in a short article titled "A dirty rotten trick." I agreed with that and was shocked for days. It took me some twenty years to realize that the journalist had fallen for an urban legend. As far as I know, the newspaper never retracted the story.