Go into the multiplayer level turf. go the the medical hut and in that vicinity, there is a Pop machine. on it it says pop, and there is a red picture of a set of teeth. Go to the other side of the level, where there is those moving doors. there is another machine, except this one say soda on it, and has a blue rooster on it. RED vs. Blue is a video animation that uses halo 1 as the engine for the graphics. red vs blues logo is rooster teeth.