A professor stood before his class of 20 senior organic
biology students, about to hand out the final exam.

"I want
to say that it's been a pleasure teaching you this semester.
I know you've all worked extremely hard and many of you are
off to medical school after summer. So that no one gets
their GP messed up because they might have been celebrating
a bit too much this week, anyone who would like to opt out
of the final exam today will receive a "B" for the course."

There was much rejoicing amongst the class as students got
up, passed by the professor to thank him and sign out on his
offer.

As the last taker left the room, the professor looked out
over the handful of remaining students and asked, "Any one
else? This is your last chance."

One final student rose up
and took the offer.

The professor closed the door and took attendance of those
students remaining.

"I'm glad to see you believe in
yourself." he said. "You all have "A"s."