Seeing the thread about the pipe and tabor on Chris Evans's show reminded me of a French guy at Sheffield Folk Festival a few years ago. He played his three holed pipe brilliantly (in fact I didn't realise it could play so many notes) but for ages afterwards I couldn't figure out what was wrong. Then it struck me that he didn't have his drum with him so he was only using his left hand to play the pipe and I realised that was what was wrong.

So are there any instruments that are designed for only one handed playing (one hand holding the instrument doesn't count and a mouth organ in a holder round your neck doesn't count either)? I think any instrument that is supported by or utilising any other body part should be excluded also. So the final question is:

Are there any instruments, apart from the aforementioned pipe, designed to be played one handed and supported by that hand?