George: "Uh, now, Biff, I want to make sure we get two coats of wax this time, not just one."
Biff: "I'm just finishing up the second coat now."
George: "Now, Biff, don't con me."
Biff: "I'm... I'm sorry, Mr McFly. I meant I was just starting on the second coat."
George: "Oh, Biff. What a character. Always trying to get away with something."