It's fast, it's easy - it's magic!
Three ordinary ropes (yes! completely ungimmicked!!)- one long, one medium and one short. In your hands, these three ropes suddenly and visibly all become the same size- you even show them to the audience one by one!
Just as magicially, you return them to their original lengths again. And best of all- you can end the trick by handing the ropes to your spectators- there is nothing to hide!
Once you know the secret to the Professor's Nightmare trick, you can do this trick anywhere, anytime, with ANY three lengths of ordinary rope or thick string! Borrow some rope, and do a trick!