Hahahaha cats. This is a very specific machinma thats really funny if you've played Halo 3, and just funny in general really. It's a follow up to Master Chief sucks at Halo 3, called Arby & the Chief, theres about 9 eps so far, I suggest you watch all of them, very funny. My roflcoppter goes soi soi soi
Link
Ok, a while back, some people were working on a Halo RTS mod for Command and Conquer: zero hour (er spelling?) called Halogen. They tried to make the tank treads bob with dune buggy physics, but messed it up...
Pimp my tank anyone? 
Edit: it has very annoying music... in my opinion anyway...
that guy has other amusing vids as well , check out 'Fargoth must die!'
Ergalla's encounter , orc-blivion and how orcs use magic as well