Knock knock. Who's there? Canoe.

Canoe who? Canoe let me in, it's freezing out here!

Knock knock. Who's there? Flour.

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

Knock knock. Who's there? Flake

Flake who? Snow-body's home.

Knock knock. Who's there? Isadore.

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