As a busker for too many years, many stories of idiotic requests.
My favourite one was when playing once on a pitch on Carnaby Street circa 1967 with the Earl of Mustard tapdancing and someone came up and said: 'Can you do any Pink Floyd numbers?' Acoustic guitar/vocals and deranged tap-dancer - if only we had tried... Can't remember what we went into but it wasn't 'Set your controls for the heart of the sun' or anything approximate - but he bunged us anyway...