Quote from J.D. in My Lucky Night
Janitor: Hey. We solved your dumb game. Troy: We been to the libary! Janitor: "-brary," Troy. "Li-brar-y." Anyway, "What two coins, when you put 'em together, makes thirty cents and one of them isn't a nickel?" Hmm. A penny and... a 1972 dime with a Roosevelt imperfection, today worth exactly twenty-nine cents. J.D.: Nope, nope, nope. The correct answer is a quarter and a nickel. Janitor: Uh, no. Because you said one of 'em isn't a nickel. J.D.: Right. The other one is. Janitor: You lied to me. J.D.: No. It's a riddle.