I was playing today with my lil bro on co-op (AOTCR) and we were at that very last door where you go in and cortana tells you to stop the cap'n and all.....well my bro managed to push me through the door without actually opening it. he did this by slowly pushing me with his ghost into the door. once inside, you can walk around and everything without the game ending. this is fun if you just want to explore or do something youve never done...i took in a sniper rifle, and on the big halo, there are icons that point that places on the Halo. i got a pretty close look at em with my sniper but couldnt really make out any english. also, i was looking at the control panel with my sniper for easter eggs and, you know the symbols used to represent a teams color like on the bases in blood gulch? well those two symbols were there as well as two other symbols that obviously related to the others. they must be what the symbols are that are going to represent other team colors in Halo 2... I also tried this going through doors deal on other levels such as Silent Cartographer. when i got to the door that gets locked with the sword elite and parked my wart hog parallel to it and got out and got pushed through the door by the warthog. very easy to do and saves you soooo much time on the level. especially useful on legendary. i havent had time to try this on any other levels yet so ill get back to you with my results...