On their second day in medical school they are given a corpse for dissection. They want to weed out the faint fast.
She came home with the next joke. Seems some fellows working on a Sunday morning after a long Saturday night decided it would be hilarious to amputate the private member of their male corpse and insert it in the female corpse of a female student.
Monday morning the female student discovered the prank. Puzzled at first, she removed the offending member, then calmly walked to the head of the class, held it up and asked in a loud voice,
"Did any of you guys lose this over the weekend?"