I wonder where they get it from

Milo: “Knock knock.”
Me: “Who’s there?”
Milo: “Eye.”
Me: “Eye who?”
Milo: “Eye’ll be back in the eye socket later. A-ha! Ha! Ha! Ha!”

———–

Milo: “Knock knock.”
Me: “Who’s there?”
Milo: “Seal.”
Me: “Seal who?”
Milo: “Seal later alligator! A-ha! Ha! Ha! Ha!”

—————–

Morris: “Knock knock.”
Me: “Who’s there?”
Morris: “Seal.”
Me: “Seal who?”
Morris: “Seal phlllllbbbbt!!!! A-ha! Ha! Ha! Ha!”

——————

Rob: “Knock knock.”
Me: “Who’s there?”
Rob: “Interrupting zombie.”
Me: “Interr–”
Rob: “BRAAAAAAAAAAAAAAAAAAAINS! A-ha! Ha! Ha! Ha!”