Knock knock. Who's there? Just me.

Just me who? What do you mean 'who'? I'm the person standing right here!

Knock knock. Who's there? Next question.

Next question who? Next question... oh, this isn't an interview!

Knock knock. Who's there? Sew

Sew who? Sew long, I've been trying to weave a good joke.

Knock knock. Who's there? Dough.

Dough who? Dough-n't worry, I'm just here for the bread!