It's almost too good not to share

Knock. Knock.

who’s there?

Owls.

Owls Who?

Yes, yes they do.

groan

Aww, don’t feel bad you’re not the first and I am sure you will not be the last.

Knock knock.

Who’s there?

shakes fist and curses at knock and run hooligans…

Interrupting starfish.

Interrupting starfish who?

falls asleep at door, toppling over and smooshing the interrupting starfish…

It’ll make a difference to this one!

Nice user name/post combo…
-D/a

My all-time favorite:

Knock knock
Who’s there?
Knock Knock
Who’s there?
knock knock
Who’s there?
knock KNOCK
Who’s there?
Knock Knock
Who’s there?
Knock knock
Who’s there?
knock knock
Who’s there?
Phillip Glass

eta: I’m totally stealing the OP joke for my repertoire.

Eggs, bacon and sausage walk into a bar and order drinks. The bartender says, “Sorry, we don’t serve breakfast.”

Ok, I’ve got one … You start…

Alright. Knock knock… (I just delivered this one to my daughter and her friends on her 13th bday, it was a hit.)

This one has to follow the owl joke.

Knock, knock