1) Being called a speed hacker for increasing FOV settings.
2) Getting killed by the 90 degree sweeping spray.
3) Getting killed by the 180 degree sweeping spray.
4) Getting killed by the 360 degree sweeping spray.
5) Getting killed by someone drawing circles with their gun.
6) Getting assassinated by a lagger when you're IN FRONT OF HIM.
7) A guy with 1000 ping tanks your whole clip then someone shoots you in the back.
8) Getting killed by the 360 degree MELEE sweeping spray.
9) Getting killed with a headshot by getting shot the in legs.
10) Getting a headshot kill by shooting someone in the legs.
11) Killing an energy hacker aka perma cloak with Nanovision.
12) Getting kicked for going 6-0.
13) Trying to votekick a hacker but nobody gives a flying fug.
14) Finding a whole legion of campers lined up in a building and spraying them all down at once.
15) Shotgun shells going through your opponent and he kills you with a spray while taking no damage.
16) Getting killed by a shotgun user that's shooting way off but someone 1 hit KOs you.
17) Everyone starts lagging and you're the only one who can move, then you kill everyone who has been standing still and get the exp & dogtags all at once a minute later.
18) Everyone starts lagging, and when the lag stops you somehow die 10 times in 1 life and watch the weirdest killcams ever.
19) You run past a guy and he doesn't even notice you, then you start chasing him down. He stops at the most random place to recover so it's really unlikely that anyone would find them. But knowing where he is, you kill him, and then the guy won't quit calling you a wall hacker.
20) You happen to be watching a killcam, then wondering why the killcam lasted so long, and why you're watching 2 death scenes. Turns out you spawned right under an Orbital Strike.
I can go on forever, but it's an FPS game, so you're going to see bull5h1t. It's not a game if there's no bull5h1t.
Hahahaha totally agree with all of them

Adding some:
21) Getting killed by a random grenade
22) Kill a player, then get killed by the grenade thrown for the dead guy.
23) Get killed, then when watching the killcam you notice that the other guy missed all of his shots aiming erratically but then makes a headshot with his last bullet.
24) Find a guy in front of you when reloading, then jump over him on his back, watch his weapon going wtf trying to make the maneuver and finally finish him off when the reload is done.
25) Getting killed by a headshot from a mounted weapon/HMG which was on the other side of the map.
26) Watching a guy trying to commit suicide in Skyline in order to avoid certain death, then finishing him off while falling. Rofl.
28) People thinking they're playing CS, ducking every time they shoot, then calling you a hacker for making the easy-peasy headshot.
29) People trying to play fair, then when realizing they're getting pwned resort to hacks.
30) Being 24-0 in IA and getting killed in the last frag.
31) Stupid retards swearing in their mother language (suka, fvck) and saying other stuff you cannot hope to understand while making cheater/hacker allegations. Laughable.
To be continued!