Luke Through The Window

Listen up, buttercup. This is a knock-knock joke. Someone says "Knock knock," and you say, "Who's there?" Then they say a name like "Luke." Then you say, "Luke who?" And they say something funny like, "Luke through the window and you'll see." It's funny because it sounds like "Look through the window." You probably already look through the window a lot, you nosy rascal!