My Boss's Free Haircut - S4-E20
Other mistake: When Bob is trying to get into the patients room, he uses a screwdriver to break in. The door opens into the room with the hinges on the inside, theres no way he could get at them and the door frame is intact as shown when the door falls in.
Answer: Dan was drinking beer and Cox feared that Dan might get so intoxicated he would fall asleep and drown in the tub.
Mortug