In a ground war match in CoD4, my gun would not fire at all, i was pretty pissed when i walked up behind 2 guys and my gun would not work. Other times i have had my gun disappear, the bullets did no damage but i could still do the re-loading animation with no visible gun. I could only wonder what the guy who killed me thought, the killcam clearly showed no gun in my hand. I've also seen countless airstrikes go where you don't place them, helicopter bullets curve around buildings to kill me. And the worst was being killed 13 times in a row by helicopters during a domination match on the Bog, i'm pretty sure that is not suppose to happen.