When Dr. Kelso's anniversary rolls around, it is the one day of the year that he actually approves equipment that costs money. Turk is responsible for getting an argon laser, and the Janitor tries to get a new mop. Meanwhile, the new residents have to hand in case studies to Dr. Kelso, the most important one going to Reno.
When J.D. doesn't get permission to do one from Mr Davis, who broke his penis, Dr. Cox tells him that he respects doctors who don't try to exaggerate diseases to try to put in a case study so J.D. decides to stay on Dr. Cox's good side. Meanwhile, the two cannot figure out what's wrong with a board member, Mrs Warner, who insists on helping Dr. Cox move ahead but Dr. Cox refuses, preferring to move up on his own.
When the Janitor makes J.D. stay in line for him to ask Dr. Kelso something, J.D. ends up wandering away, into Mr Davis' room who decides that J.D. can use him in his case study. J.D. decides to hide this from Dr. Cox, to remain respected.
The next day, Turk is in a lot of trouble because he was too late in asking Dr. Kelso for the laser, but when he finally decides to go to Kelso, Bob, reveals that his wife is at fat camp, and Turk realizes that he's been lying for years, and blackmails him into getting surgery the argon laser.
Meanwhile, the Janitor uses his old mop to make J.D. fall and spread the dirty water over his face. To stop it from happening again, J.D. buys him a new mop, the Janitor being lost for words.
When Mr. Davis retracts his approval on the case study and J.D. is threatened by Dr. Kelso to hand one in, J.D. decides against it to stay friendly with Dr. Cox. But when Dr Cox and J.D. realise that Mrs Warner has a very unique disease, J.D. is forced to choose between a certain Reno trip or staying with Dr. Cox. He decides to ask Mrs. Warner and with her approval, his case study is accepted and wins as the most interesting. When Dr. Cox lectures J.D. on selling his soul, J.D. tells him that it's okay to ask for help to further his career. While Dr. Cox has less respect for J.D., he realises his point and asks Mrs. Warner for a recommendation.
The Janitor reverts back to his old mop, because while it doesn't soak up water, he can still use it to torment J.D.