Pork pie hat

I always liked the work of Buster Keaton who was a great director, actor, writer and stunt man. There were stunts that he performed that still baffle people who understand movie making. I can't find the clip I am thinking of, but here is a link to a chase scene - who hasn't been there, amirite?

I have no idea what the setup is, but it must have been a dilly.

Only one piece of music goes with this story.