Knock! Knock! Who’s there? Leon…

Knock! Knock! Who's there? Robin. Robin who? Robin you, now hand over the cash!

Knock! Knock! Who's there? Lettuce. Lettuce who? Lettuce in it's cold out here.

Knock! Knock! Who's there? An extraterrestrial An extraterrestrial who? Wait–how many extraterrestrials do you know?

Knock! Knock! Who's there? Andrew! Andrew who? Andrew a picture!

Knock! Knock! Who's there? Bruce. Bruce who? I Bruce easily, don't hit me !