The thing that annoyed the hell out of me in Crysis was when in Mesa, someone else and I would be having a helicopter fight, and sometimes one of us will fly to the out-of-bounds zone, due to tilting the nose back to shoot upward. Then it would give a 4 second countdown or something, and what is really stupid is that when it starts, you have to tilt way down, and HOPE to get out of there in time, which, chances are, you won't. And by tilting your nose far down, you'll get annihilated by a barrage of rockets hitting the top of the helo.