Anybody, anyplace, and anything becomes a punch line for knock-knock Knock-Knock! Who's there? Heidi . Heidi who? Heidi Claire, something smells delicious. Try it with Daniella. ( Daniella so loud, I can hear you just fine .) Or, with disguise. ( Disguise killing me with these knock-knock jokes .) Soon you'll turn everybody and everything into your own knock-knocks, and you won't be able to stop till somebody knocks you down!