Well this isn't a joke exactly, it's from a genuine pub conversation I had with a couple of mates.
We were talking about Blues musicians and noticed how many of them were blind, or at least according to their nicknames, Lemon Jefferson, Willie McTell, Willie Johnson to name but a few. We then went on to wonder how many ailments afflicted other blues musicians leading us to ponder over the more obscure Deafmute Magee, Gammy leg Hank Jones, Gastroenteritus Joe Smith, Ingrowing toenails Henderson and Goutfoot Charlie Washington.
I guess you had to be there...