At the (sort of) request/suggestion of
a female version of the Master Chief or Spartan from the popular Halo series.
Which I have not played a second of, not even at a store. It just didn't seem that great, my total interest in FPS lost after the release of Soldier of Fortune II for the PC, so totally not a killer app to convince me the X-box is worth buying. That said, bears repeating first/last console was SNES so not interested in any console...
I will admit those physics videos were amusing though