It was not obscure at the time, but Bullitt.
The chase scene only. The rest of the movie is a waste of celluoid.
It used to be you could find the complete chase scene in one video. Now you have to look around you can find all of the different parts. And hopefully you can find one to watch that some backyard 21st Century cinema photographer has not butchered to shit.
I finally bought the DVD just so I can watch the chase scene every once in a while.