They don't have doors. Therefore it wouldn't be a knock knock joke. Merely a "joke".
Knock Knock Knock Penny male t-shirt.
Too Early For Volcano Jokes? male t-shirt.
I Try Not To Laugh At My Own Jokes male t-shirt.
I Don't Like Jokes On Shirts... Here's A Cake Recipe male t-shirt.
Jokes - I always punch up the F***line male t-shirt.
I Tell Bad Chemistry Jokes Because All The Good Ones Argon male t-shirt.
