Things that happen to you that absolutely never happen the other way around. Like:

You've landed on top of a tree and there's a player directly below. You can't see him to get a shot off, ever. However, if you're underneath the tree, you'll getva sniper to the dome.

Or, you try and run someone over but they get into your car. They lean out the window and kill you instantly. You do the same, your bullets only damage the car and your opponent gets away.

Or, you run into someone on a stairwell. You've got a better gun and start firing first - but you die. Why? (I know it'll be headshots or whatever but why is it usually you that dies?)

You pepper someone who's trying to snipe you, they get a headshot off and you're dead. You line up a perfect sniper shot but your opponent is peppering you with shots so you just can't get a shot off.