Dr. Kelso: You seem to be developing a rapport with your interns.
J.D.: We even spent this weekend building a house for the homeless.
Dr. Kelso: How'd that go?
[flashback to a construction site: Rex playfully flicks paint at J.D. J.D. then uses a buzz-saw to cut off Rex's tie.
Rex. When J.D. looks back, Rex is bleeding from a deep, horizontal cut right across his chest.]
J.D.: In my defense, who wears a tie to a construction site?