One of the most unique things about Halo is the multiple different communities it has spawned: there are the pro gamers, the people knee deep in the lore, the folks who love leaping around like Mexican jumping beans, and then there are the people who 'stunt': AKA the players who make Warthogs explode into the air.
It's called 'stunting' or, at least, it's one facet of stunting, a super broad area of expertise which basically involves exploiting glitches to spectacular effect.
This series of videos is the end result of seven years of work on Halo: Combat Evolved. It is literally a visual, YouTube book on all the possible 'stunts' you can achieve in Halo, focused in the Blood Gulch map. It teaches you how to exploit those glitches and pull off all those spectacular clips you've seen over the years.
Don't get me wrong, some of this series is bloody boring — there's no other way to describe it. So much of it focuses on stuff like balancing Tanks on precarious ledges and what not — the kind of stuff that no lay person has any real interest in — but if you want to learn how to blow stuff up real good in Halo? This is a solid resource!
You can find out more about the project here.