Don't ever leave the table in the middle of an argument...
I’m DMing Pathfinder for a group of six players (around level 7) whose characters don’t really see eye-to-eye. They had just taken down a boss with a sleep arrow and were discussing whether they should kill him or let him live.
LG Monk (IC): I say we let him live. Killing him only makes us as bad as him. And anyway we need to question him.
Rogue (IC): But if we let him live nothing will change.
Oracle (IC): I agree.
LG Monk (IC): No. No I won’t let you. We’ll question him and take him to the guards.
OOC the guy who plays the monk goes to the bathroom.
While he is gone:
Rogue (OOC): Can I stealth and then make a Coup de Grace attempt on him without (LG Monk) seeing?
DM (Me): Oh my God, OK, give it a shot.
*Rogue proceeds to roll an insane Stealth check (somewhere in the 30s) and roll huge damage on the attack.*
DM (Me): *laughing* OK, Jesus, yeah. You fire an arrow straight into the unconscious man’s skull. He is well and truly dead.
The monk’s player returns to the table.
DM (Me): Hey, can I get you to make a perception check real quick.
LG Monk (OOC): (Assuming he’d just missed something) Yeah sure, that’s a uhhh… 16?
DM (Me): Yeah ok, never mind.
LG Monk (OOC): Right, I pick the man up and put him on my shoulder. We can take him somewhere safe to question him.
At this point the rest of the party is trying really hard to keep from laughing. The monk is getting suspicious.
LG Monk (OOC): Actually I’ll try to wake him up here. I give his face a slap.
DM (Me): As you go to slap his face you see the shaft of an arrow protruding from his skull, his face is covered in blood.
LG Monk (OOC): WHAT! (Looks at the people giggling around the table) I SENSE MOTIVE THE PARTY!!!
Everyone rolls terrible Bluff checks.
DM (Me): The rest of the party bursts into uncontrollable laughter.
LG Monk (OOC): GUYS! ARE YOU FUCKING SERIOUS?!?!?!?!
OOC everyone actually bursts into uncontrollable laughter.
The next session that player swapped characters. He said playing someone Lawful Good wasn’t a good fit for the party. He was definitely right.