One of my faves was when I was the critical care clin spec and already famous for answering any question, anytime, anywhere, or getting the answer if needed. The chaplain (age 50s) stopped by my office one afternoon; his wife was having a hysterectomy and he wanted to know where the sperm would go after the surgery. I told him it was pretty much the same place it always went before: wet spot.
My second fave of all time was when I was working open heart surgery ICU. The night before we always had tomorrow's fresh hearts and their NOK come for a little orientation talk about heart surgery, what to expect in the ICU, see an empty room, answer questions, and such. One of our very talented staff nurses made a big chart-sized set of illustrations showing the tubes and wires and stuff when they arrived, sounds they'd hear, visiting hours, and then we would peel back the pages one by one by one to show extubation and the vent disappearing, the chest tubes coming out, the Foley, the vein harvest site dressings coming off, and all. We also asked about particular types-- who's having a valve, who's having a CABG, and all that. We took the roll from tomorrow's OR schedule; anybody who was too sick in CCU to come visit us got a bedside visit when we were done.
One evening it was my turn and things were going really well, but I could see one guy looking really more and more upset and anxious. I stopped and said, "Did I say something that upset you?" And he said, "I'm having surgery tomorrow for chest pain but it's NOT MY HEART!!!" I looked on the schedule and there he was, CABGx3, 0700. OK, mmmm.
I excused him from class and called the chief resident to let him know that he needed to do a little more patient prep on this one...