Sometimes even the calmest GMs snap.
Context: Walo, our aasimar cleric, has suggested diplomacy for every creature in this dungeon, including a griffon, three dust mephits, and a giant scorpion. She did this for the last dungeon too. Everyone was started to get pissed that she would use her first turn in every combat to try futile diplomacy rather than something useful.
Normally-stoic GM: Alright, now it’s Walo’s first turn. {He glares at the player playing Walo, a little ticked.}
Walo: Well, all the lamia did was hiss at us angrily, then we tried to kill it. {The GM’s face clearly says “Don’t you dare.”} Don’t you think we should try d-
GM, louder than anything he’s said in the last two sessions: SHE’S CHAOTIC EVIL, YOU IDIOT!