My son went to see a jazz-fusion band last night called Polar Bear and I asked him what the line up was.

"Good percussionist, double bass player, sax player and the other guy played various things - guitar, mandolin, laptop and a balloon..."

Yep, apparently you can play along - in tune and time - on a balloon.

A friend plays tunes on a bicycle pump.

Any other strange ones you've come across?