Knock knock. Who's there? Dew.

Dew who? Dew-n't worry, it's just a drop in.

Knock knock. Who's there? Dough.

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

Knock knock. Who's there? Isadore.

Isadore who? Isadore a lock on this door, or is it just glued shut?

Knock knock. Who's there? Flour.

Flour who? I knead you to let me in, it's a loaf-ing matter.