Things to avoid with your 360
I can think of a few things.
1) Rest your power brick on the carpet - overheating and shutdown, scorching possible.
2) Move the 360 while it's on with a disc in the drive - you could horribly scratch your disc.
3) Play Call of Duty 2's single player campaign without patching it via Xbox Live - you could lose all your saves.
Are there are any more that I'm forgetting?