Quote from Dr. Kelso in My Common Enemy
Dr. Kelso: Dr. Clock, may I have a word? Dr. Cox: Uh-oh, it's payback time. Dr. Kelso: I got you a present for your trip to Mexico. It's my old Spanish-to-English dictionary. I don't need it anymore I've mastered the language. Dr. Molly Clock: Gracias, Senor. Dr. Kelso: You're welcome-o! Dr. Molly Clock: [to Dr. Cox] You were right payback's a bitch.