Look, Doc, you gotta help me. You're the only one who knows how your time machine works.

Time machine? I haven't invented any time machine.

Okay. Okay, I'll prove it to you. Look at my driver's license. Expires: 1987. Look at my birth date, for crying out loud, I haven't even been born yet! Oh, and look at this picture. It's my brother, my sister and me. Look at her sweatshirt, Doc, class of 1984.

Pretty mediocre photographic fakery; they cut off your brother's hair!

Listen, Doc, you got to believe me.

Then tell me, Future Boy. Who's President of the United States in 1985?

Ronald Reagan.

Ronald Reagan? The actor!? [chuckles in disbelief] Then who's vice-president, Jerry Lewis? I suppose Jane Wyman is the First Lady? And Jack Benny is Secretary of the Treasury!