(Jack walks up to Sawyer while reading)
Sawyer: If you're looking for a stool sample, you can forget it.
Jack: You've been reading a lot since we came to the island.
Sawyer: Okay, so what?
Jack: (serious) You uh, you've uh, got hyperopia.
Sawyer: (stunned) Hyperopia? That's uh, what is that?
Jack: You're far-sighted.