Anyone noticed you can play music with it?
Just grip one end of a yard-ish long offcut, and swing it round like Tex Ritter [ showing my age agin! ] a-twirlin' his lariatt. The centripetal forces pump air down the smurf so it plays like a bugle- sets of fixed notes depending on the rpm. With a bit of practice you can play bugle stuff like the Last Post, Reveille or, for the really sophisticated, Beethoven's Fifth !
Alan
