Funny. I never thought it would be you

Biff Tannen:

So there I was, minding my own business. This crazy old codger with a cane shows up. He says he's my distant relative. I don't see any resemblance. So he says "How would you like to be rich?". So I say "Sure." [shows Marty the almanac] Biff Tannen:
So he lays this book on me. He says this book will tell me the outcome of every sporting event 'til the end of the century. All I have to do is bet on the winner, and I'll never lose. So I said, "What's the catch?". He says, "No catch. Just keep it a secret." After that, he disappeared. I never saw him again. [puts the almanac back in his safe. Marty discreetly takes a pair of matches from Biff's desk and puts them in his pocket, hoping they'll come in handy for later use] Biff Tannen:
Oh, and he told me one more thing. He said, "Someday, a crazy, wild-eyed scientist or a kid may show up asking about that book. And if that ever happens..." [takes out his gun and cocks it] Biff Tannen:
Funny. I never thought it would be you