You have two coins that equal 30 cents - congratulate
Joe Rose: Troy
The Janitor : Hey! We solved your dumb game.
Troy : We been to the libary!
The Janitor : -brary... Troy! Library! Anyway, what two coins, when you put 'em together, make 30 cents and one of them isn't a nickel? Uhm... A penny and a 1972 dime with a Roosevelt imperfection, today worth exactly 29 cents.
Dr. John 'J.D.' Dorian : No, no no. The correct answer is a quarter and a nickel.
The Janitor : Uhm, no, because you said one of them isn't a nickel.
Dr. John 'J.D.' Dorian : Right. The other one is.
The Janitor : You lied to me.
Dr. John 'J.D.' Dorian : No. It's a riddle.
[leaves]
Troy : [to the Janitor] Uh, your face is red like a strawberry!
The Janitor : ...Don't have kids.
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