Horrible joke

Three medical students shared a house. Despite all they learned about lung cancer, one remained a heavy smoker, starting every morning with a great fit of coughing, spluttering and gapsing. The others would greet him when he came to breakfast with the warning "One of these days, you're going to cough your guts up!". They reached the part of the course where they started dissection of bodies, and the non-smokers decided to play a trick on the smoker. They got him thoroughly drunk, put him in bed, and then laid out the guts from their cadaver on the floor. The next morning, they heard the usual coughing coming from his room, followed by a deep groan. A few minutes later, he staggered into the kitchen, white as a sheet. "What's up- did you cough your guts up?". "Yes, but that wasn't so bad", he replied shakily, "it was putting them back in".