The Muppets creators are staging a cheeky puppet show for adults only at Scotland's Edinburgh Fringe festival this year (06). Jim Henson'S PUPPET IMPROV, led by the late Henson's son BRIAN, are already staging more innocent shows for kids during the day. But when night falls, the puppeteers ditch their inhibitions, allowing the audience to suggest raunchy themes on which to build their improvised sketches. And Henson is sure his father, who died of pneumonia in 1990, would have appreciated the naughty show. He says, "I think he would have loved it because of how outrageous I get. My Dad really believed in community and sweetness but the other side of him was incredibly naughty. "He always said the only reason we did this was those moments where it is like laughing in church. It becomes so infectious you cannot stop laughing. "It is lovely to do a show where you can go wherever your brain takes you."