Some strange things can get left lying around, but how about this?  Leaving a piano at the top of Ben Nevis in Scotland???

The strange sight was found by conservation volunteers who were cleaning up the peak.  It's not the first time a strange object has been left atop of Ben Nevis.  In 1911, a Model T Ford was left there as an early promotional stunt.

If you can fathom this one out, answers on a postcard please to the usual address!!!