Last week in Pathfinder:
DM: You've successfully reached the bottom of the ocean. You see an underwater mountain dotted with glowing coral. Half a wrecked ship appears to be sitting against the side.
Me: I swim over towards the ship.
DM: You peer through one of the portholes. Most of the ship is filled with rubble, but the captain's quarters appear to be mostly clear, though home to several large growths of razor sharp coral. You also see a chest inside this room.
Me: I take 20 on my Perception check to peer through the porthole.
Rogue: I Shadowjump inside!
Me: ...
DM: Roll a Will save.
Rogue: Uh, 7?
DM: Right, we'll be going by round now. First round, Wizard peers through the porthole, Rogue steps through the shadows inside the room. [Dice roll] Nothing else happens.
Me: Okay, forget taking 20. I ask Fighter to break into the room instead and Rogue to search the chest for traps.
Fighter: I swing my Earth Breaker into the wood.
Rogue: I search for traps.
DM: Second round. Fighter breaks into the captain's quarters. [Dice roll] Rogue finds no traps on the chest. It is, however, locked.
Me: I ask Rogue to unlock the chest as I enter the room.
Rogue: I attempt to unlock the chest.
Fighter: I open the chest.
DM: Third round. [Dice roll] The chest is easily unlocked. Inside is a large pile of gems of varying qualities.
Me: I scoop up as many gems as I can and put them in my pack.
Fighter: I help.
Rogue: I use Sleight of Hand to pocket a few for myself!
DM: Fourth round. [Dice roll] Wizard manages to spot Rogue pocketing the gems. You successfully gather half of the chest's contents. [Note handed to Rogue]
Me: I grab more gems and mention that I'll need to appraise the ones Rogue took later.
Fighter: I grab more gems too.
Rogue: I stick my tongue out at Wizard and make farting noises.
DM: Fifth round. [Dice roll] You've gathered all of the gems from the chest. [Note handed to Rogue]
Me: I leave the ship.
Fighter: I search the bottom of the chest to check for secret compartments.
Rogue: I attack Fighter! [Dice roll] Two hits vs. flat-footed AC, sneak attack on both... 50ish damage!
DM: Sixth round. Good hits. Fighter is bleeding heavily in the water after being stabbed in the back twice. How do you respond?
Me: I stare in utter horror and shout at Rogue to explain himself.
Fighter: I take it personally and hit him with my Earth Breaker. [Dice roll]
Rogue: ...uh, is that a natural 20?
Fighter: Yep. [Dice roll] Does 30ish confirm?
Rogue: Um... yeah.
Fighter: [Dice roll] Okay, you take 100 damage.
Rogue: ...
DM: Rogue's head is transformed into chunky salsa.
tl;dr: Rogue tripped Confusion trap, decided to try to use it as an excuse to rob the party, karma served him poetic justice.