Slick trick

A man walks into a library, and puts $5,000 on the counter. The
librarian looks up, and the man speaks
"I bet you $5000, ma'am, that by this time tomorrow, your nipples will
be gone."
The librarian was flabbergasted... all she could manage was "WHAT?!"
The man continutes:
"I'm dead serious! Here's the $5000! But by tomorrow, I bet that your
nipples will be gone."
The librarian answers "You're on, pervert."
The librarian takes a cab home, to avoid breast-slashing maniacs, and
stays away from all sharp objects in her house. She shows up to work a
little late the next day, slightly nervous. The man from yesterday walks
in, with an accomplice.
"Well?" Asks the man.
With that, the librarian removes her shirt, and proves that her nipples
are still in place. The man hands over the $5000, and the accomplice
hands over an envelope.
"What was that all about?" asks the librarian?
"Simple" answers the man. "This guy bet me $20,000 that I couldn't walk
in here and get you to show me your tits."