Doctor in the House S07E08 - What's Op Doc?

Duncan takes charge of a group of new students and tries to get in with them by playing the joker and recounting his own japes as a young student. Following an operation he is aghast to find that there is a spare body part in the bin. He fears that he has done something wrong but in fact it's the students playing a joke on him. He needs to get his own back.