Since it seems abundantly clear that a large portion of players don't know how to handle friendly fire, i thought i'd post a little bit of common sense for them.
1) If you don't have a clear shot at your target, don't fire. There's nothing worse than getting shot in the back by someone who only has a one in a thousand chance of hitting their target. Yes, it may suck to see your teammate torn apart infront of you, but if you fire and hit him, you're only making it worse.
2) Parasiting. Christ, can people NOT parasite other aliens at the start of the game. I'm sick of it. Yes, it may only be a few HP off, but with the skulk's lower armour, every single piece of hp and armour counts. What's more, it's irritating as goddamned hell. Don't do it.
3) If you do accidently bite or shoot someone, apologise straight away.
4) If you do accidently TK, again, apologise ASAP, explain that it wasn't intentional.
5) If you have a GL or are throwing a grenade, look at number 1. Memorise, learn and love rule number 1. Do NOT GL spam into groups of your own team and absolutely, under no circumstances, fire your GL when you have little chance of hitting your target.
6) If you're a skulk and you leap into a building, make sure you tell your team it was you, and there's no trouble there.
7) If you leap the hive, same thing.
When the game starts. Do. Not. Bite. The. Hive. You have no idea how many people do this, it's ridiculous. Mainly NSPlayer nubs, but still, you need that thing to live, DON'T DO IT!
9) Even if someone's within healing range of DCs or a hive, don't bite them. The amount of times people have bitten me and think it's all a great joke. It's not. It's goddamned annoying, cut it out and don't do it.
10) If you're an Onos choose your targets. If you're rushing a base, attack something someone else
isn't attacking. The amount of times i've been in marine start chewing on a TF or IP, nearly having it down, only to be punted halfway across the room because some Onos wanted to get there, is as usual, ridiculous. If two skulks are attacking an RT, move along. They're doing more damage and faster than you could do, but the second you attack it they will be thrown away.
You have no idea how sick i am of people intentionally biting me, parasiting me or generally being a lame f*ck just because ff is on. Cut all that ^^ out, it's annoying as hell and counterproductive to the game's goals.