WAIT! DON'T LEAVE YET!
Now, you might be thinking that you're about to read a cool theory on Back to the Future. But you also might be thinking that this is stupid because Biff obviously caused George to punch him because of how mean he was to Lorraine. But here's the theory:
Don't you think it's a little bit weird for George to react that way to Biff? I mean, I get that he was infuriated by the way he was treating Lorraine, and if I were him, I'd be furious, too. But how would George punch Biff across the face when he's been afraid of Biff for so long?
I think in order to act that way, George needed all that anger and something else:
Well, let's take a look. In Back to the Future Part II, Marty travels back to 1955 and goes to the dance again. At one point, we see this:
That's Biff pouring liquor in the fruit punch. The theory says that George acted that way to Biff because of the spiked punch. Now did we actually see George drink the punch? I mean, the punch may have been spiked, but how do we actually know he drank it?
Here ya go:
He was drinking the punch right before he ran up to the car and punched Biff. That's why he behaved that way. In fact, maybe writers Robert Zemeckis and Bob Gale put "Biff puts alcohol in punch" bit on purpose because without this purpose, it really doesn't advance the plot.
Do you think it's true?