I think about it all the time.
3 seconds sound clip from the Back to the Future Part III movie soundboard.
You can hear this line at 01:03:08.001 in the DVD version of the movie.
Quote context
[...]
- Wait a minute. Wait a minute. You have a brother named Martin McFly?
- That's how he got a Bowie knife shoved through his belly in a saloon in Virginia City.
- Never considered the future, poor Martin. God rest his soul.
- Sure, and I hope you're considering the future, Mr. Eastwood.
- I think about it all the time.
- Listen to me. I feel like I'm teaching school.
- Definitely. Although not for 84 years and not on trains.
[...]