"Alligator" joke

A guy walks into a bar with a pet alligator by his side. He puts the alligator
up on the bar. He turns to the astonished patrons. "I'll make you a deal. I'll
open this alligator's mouth and place my genitals inside. Then the gator will
close his mouth for one minute. He'll then open his mouth and I'll remove my
unit unscathed. In return for witnessing this spectacle, each of you will buy me
a drink."
The crowd murmured their approval. The man stood up on the bar, dropped his
trousers, and placed his privates in the alligator's open mouth. The gator
closed his mouth as the crowd gasped. After a minute, the man grabbed a beer
bottle and rapped the alligator hard on the top of its head. The gator opened
his mouth and the man removed his genitals unscathed as promised. The crowd
cheered and the first of his free drinks was delivered. The man stood up again
and made another offer.
"I'll pay anyone $100 who's willing to give it a try". A hush fell over the
crowd. After a while, a hand went up in the back of the bar. A woman timidly
spoke up. "I'll try, but you have to promise not to hit me on the head with the
beer bottle".