I've killed a dwarf that was counting down for an orc vs dwarves on my first month (and it was my first skirmish), the conflict started straight up because i killed him. Since he was killed by fall damage, no one knew it was me :)
Back in mid-Thales, when I first joined, I didn't know that your * emotes went outside of whisper even while in whisper channel. So I went through a whole FTB in local channel on accident, in a castle full of people. No one even told me until it was too late :(.