- Why? What happens after it hits 2000?
- The whole boiler explodes!
- Perfect!

7 seconds sound clip from the Back to the Future Part III movie soundboard.

You can hear this line at 01:35:55.759 in the DVD version of the movie.

Quote context

[...]

- Okay, we're cruising at a steady 25 miles an hour, Doc.

- I'm throwing in the Pres-to-Logs.

- Marty, the new gauge on the dashboard will tell us the boiler temperature.

- It's color-coded to indicate when each log will fire. Green, yellow and red.

- Each detonation will be accompanied by a sudden burst of acceleration.

- Hopefully, we'll hit 88 miles per hour before the needle gets much past 2000.

- Why? What happens after it hits 2000?

- The whole boiler explodes!

- Perfect!

(GASPS)

- Hey, Doc! We just hit 35!

- Okay, Marty. I'm coming aboard!

- You better hold onto something, Doc! The yellow log is about to blow!

- Golly.

[...]