Back to the Future or Harry Potter and the Chamber of Secrets?

Are you a fan of Harry Potter and the Chamber of Secrets? Of Back to the Future as well? Prove it! Select which quote belongs to which movie and see how good you are:

- Promise me something.

- Anything, sir.

- Never try to save my life again.

If my calculations are correct, when this baby hits 88 miles per hour... you're gonna see some serious shit.

It is not our abilities that show what we truly are. It is our choices.

- 1.21 gigawatts! 1.21 gigawatts. Great Scott!

- What-what the hell is a gigawatt?

- We better back up. We don't have enough road to get up to 88.

- Roads? Where we're going, we don't need roads.

Why spiders? Why couldn't it be "follow the butterflies"?