Tim tests his lungs...

Tim Rowett welcomes an old friend Clive Panto to the Grand Illusions tv studio, and Clive brings with him an amazing contraption. Sometimes called a blow back pipe, this weird device is made largely from brass and was apparently used by miners in Wales to check out how well their lungs were working.

If you blow hard enough into the gadget, which looks a bit like a metal pipe, then this causes the little windmill to spin. Clive manages to get it spinning well enough. But then he passes it across to Tim to have a go, and things do not go entirely according to plan...