For the list of Knock Knock jokes I like, I won't put the usual Knock Knock ... Who's there? part of the joke. I think that would get rather monotonous after a while. So what I'll do is just put the name, then the punchline on a separate line. There will be a blank line between jokes. So, with no further adu:
Amos
Amos-quito bit me.
Andy
Andy bit me again.
Repeat
Ok, Who who who ...
(I know Repeat isn't a name, but I thought it was funny anyway.)