As a solo act, when someone shouts out for me to play it, I play the music but sing the first two verses of Amazing Grace. Gets a good laugh, and then I move on.
Thanks to TGP threads I am working on 'Don't fear the Geezer' ...I don't know who posted it first but it strikes me as funny!
(PS, I will play it in Am, but I'll sing it with a Cockney accent.)
(Hopeful that live performances come back in fashion soon.)
Yeah I hope they come back too.