Knock knock. Who's there? Wire.

Wire who? Wire you not opening the door?

Knock knock. Who's there? Hearse.

Hearse who? Hearse a real groaner for ya: I used to be a baker, but I couldn't make enough dough to roll with the big timers!

Knock knock. Who's there? Egg

Egg who? Egg-cuse me, I'm cracking under the pressure to make a good pun.

Knock knock. Who's there? Oblivion.

Oblivion who? *everything ceases to exist*