J.D.: [v.o.] And insignificant events can lead to significant events. Like me being on time and Dr. Cox being late for a change.
Dr. Kelso: Where the hell is Dr. Cox? His shift started four minutes ago!
J.D.: [v.o.] Uh-oh. You've gotta cover for him.
[fantasy: As J.D. starts playing the banjo, Dr. Kelso dances]
J.D.: Have to learn to play the banjo.
Dr. Kelso: Dammit, son, are you listening to me?
J.D.: Yes, sir!
J.D.: [v.o.] And buy a banjo.