Luke: Does it hurt?
Rory: No, not really. Just itches a little.
Luke: Yeah, I can imagine. Make sure you don't use a pencil.
Rory: Excuse me?
Luke: Your arm, you know, when it itches? I broke my arm once. Itching drove me crazy. Grabbed a pencil, shoved it down the cast to scratch, you know...
Rory: Bad results?
Luke: Bad results.
Rory: Got it. No pencils, I promise.