Once, Jim and I were stuck in Toulouse after the homeless people's breakfast with no money for the car park.
Out came the guitar - "Desperado, why don't you come to your senses." Result.
The only problem with that spot was there was a homeless chap called Patrick who'd come up and play the harmonica. He was brilliant but unfortunately he had this infection or something all round his mouth. Don't know what it's called in English but in French it's called "la gale."
So that's when I bought some Steradent and started soaking the mouth organs overnight.