When our mob of morris sing "Martin Said" we do it as a sort of challenge in-the-round, when we all have to sing a verse, some (most on a good night) being made up on the spot.
My favourite is:-
I know the words to every song
Fie, man, fie.
I know the words to every song
Who's a fool, now.
I know the words to every song, but sometimes they come out incorrect.
Thou hast well drunken, man. Who's a fool now.

That and dyslexic verses have always gone down well.
(but they don't translate into Cajun French!)