Apparently nobody uses the in-game team chat in Bad Company 2 on PC so lots of people use Mumble. Unfortunately that can have unforeseen consequences when both teams are on the same Mumble server…

Defender: Watch out guys, we have enemies in the back of our base
Attacker: …….no i’m not……

Next time I fire up the game on PC I’ll join that Mumble server and see for myself. (via)