[god creating alligators]
God: See that log?
Angel: Yes...?
God: Now fill it with teeth.
Angel: Say again?
God: FILL IT WITH TEETH!
[god creating alligators]
God: See that log?
Angel: Yes...?
God: Now fill it with teeth.
Angel: Say again?
God: FILL IT WITH TEETH!
Alright, listen up, buttercup. You, the joke teller, clearly don't understand that this is a joke about how God created alligators. The humor comes from the absurd idea of filling a log with teeth, which is exactly what an alligator's mouth basically is. It's unexpected and kinda funny 'cause it's so ridiculous. Get it now, genius?