If you play like a gajillion hours of xbox and then go to the main menu of the xbox dashboard and press xy (or maybe yx..) the green X will spin in circles a little bit.
let me know if this has happened to you.
BTW I am not lying, this is all really happened to me...
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OK, what the topic poster is talking about is an easter egg that is in the Xbox Music menu. Play some music on yer xbox and look to the left of the screen. It will show a little oval shaped thing that lights up with colours when ever u play music. If u press X and Y at the same time, the little oval thing will become FULL screen and show all the flashing colours and then u stare at it for an hour and get a seizure. srry bout teh spelling ^_^