I remember "surf" maps in CS that (ab)used the physics for crazy obstacle courses. IIRC there were similar ones in UT.

I see it's still a thing in CS:GO: https://www.youtube.com/watch?v=hMsPf8eSW3k

And I'm 95% confident that surf maps were one of the inspirations behind Titanfall. Here's a completely broken tool-assisted speedrun of the obstacle course: https://www.youtube.com/watch?v=yXtggqe6oo0