You know you're on the wrong team when...

[agentkuo]

You know you're on the wrong team when your teammate is camping with a shotgun.
(Uncharted 3)

And then everyone comes up with more. For whatever game you want. I think you guys get the idea.

[Gardocki]

You know you're on the wrong team when everyone else goes negative on K/D. There's nothing worse then being the only guy who can hold his own.

[ThatOneFriendlyNerd]

You know your on the wrong team when everyone is far too serious. Have some fun people.

[retrolinkx]

You know you're on the wrong team when you're losing 20-3 because no one else apart from you is trying to get the objective.

[SERIOUSLY THOUGH]

You know you're on the wrong team when you can hear screaming for even the smallest of issues

[The Antagonist]

You know you're on the wrong team when they kill you for the sniper. (Halo 3/Reach)

[BumblebeeCody]

You know you're on the wrong team at EVO when you don't have a horse head crowd monster supporting you

[Sohakmet]

You know you're in the wrong team when there's more than 4 spies.