I find it happens to me more when playing Halo 3 or Halo Reach, rather than playing other games like MW3 or BlackOps2 or Battlefield 3.
Discussion Topic: Why do you suppose that more people t-bag in Halo?
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In Halo there is a "suction" effect, causing the head to bounce up and down (if you do it right). In other games it's just meh.