heres one from a game I read about in an NWN Dumbest Player forum thread...
A character had made a rouge and had aquired a wand of fireballs with like 20 charges, which use magic device let him use. As they were searching for a princess help prisoner at the castle, they came across a row of ten doors.
Thief: "I go up to each door and detect traps."
DM: "you find no traps, and the doors are unlocked."
Thief:"Okay I go to door # 1, open it, use my fireball wand, close it as fast as possible."
DM: "As you shut the door you hear some sizzling, inside the room you find 3 dead rats"
Thief: "Door #2, open, fireball, close"
DM: "blah blah blah"
Thief: "Door #3, open, fireball, close"
DM: "blah blah blah"
Thief: "Door #4, open, fireball, close"
DM: "blah blah blah"
Thief: "Door #5, open, fireball, close"
DM: "blah blah blah"
Thief: "Door #6, open, fireball, close"
DM: "blah blah blah"
Thief: "Door #7, open, fireball, close"
DM: "blah blah blah"
Thief: "Door #8, open, close, fireball"
Thief: "No wait, I mean..."
DM: "You are suddenly hit by a wall of fire at close range, the nearby party is also hit"
DM: rolls dice
Party: all dies
Thief: rolls reflex save, fails cause its a spell cast as if from a level 15 wizard, and he is like level 3.
DM: "You take" rolls "42 damage"
Thief: "But I only have 14 hp"
DM: "too bad you didnt halve the damage with that reflex save..."
Also what WOULD have been funny but didnt actually happen...
Thief: "Open door, fireball, close door"
Thief: "I open the door and look inside"
DM: "You see 4 humanoid figures, 3 are on the ground, and one is in an incinerated chair, you spot a melted tiara on the head of the princess."