Marty McFly: Tough break, kid. Must be rough bein' named after a complete butthead.
Marty McFly: What's that supposed to mean?
Marty McFly: [Biff knocks on Marty's head with his cane]
Marty McFly: Hello? Hello? Anybody home? Huh? Think, McFly! Think! Your old man, Mr. Loser?
Marty McFly: What?
Old Biff: That's right. Loser with a capital "L".
Marty McFly: Look, I-I happen to know George McFly is not a loser...
Old Biff: [interrupts him] I'm not talkin' about George McFly. I'm talkin' about his kid! Your old man, Marty McFly Sr.? The man who took his life and flushed it completely down the toilet.
Marty McFly: I did? I - I mean - I mean he did?