Short Final: It’s Been Done

I recently heard this at Detroit Metropolitan Airport:

Tower: "Airliner 123, left turn to heading 185. Cleared for takeoff 21R."

Pilot: "Right turn 185, cleared for takeoff 21R."

Tower: "That's a left turn, 185."

Pilot: "Left turn 185 ... that would've been a really long right turn."

Tower (completely deadpan): "It's been done."