D&D 2e party level 15+: they're hunting down the last of a long series of quest items in a semi-active volcano. Moving through the caverns they run into a gas-spore (beholder-looking gas bomb). They attack it, set it off, fail a few saves, move on with life.
A few hours later they discover a fairly scary looking monster (modified manticore). They do some scouting to see if they can go around it and the psychotic ex-elf now-drow cleric finds what he thinks to be a gas spore. When the party leaps to attack, he grabs the "spore" and runs towards the fray. Unfortunately, it's a sleeping bloodkiss, the vampiric variant of a beholder. He barely survives with his life.
Same group, the party is entering a town. The wizard decides that the drow cleric is a problematic individual and decides to polymorph him into a mouse without asking. The drow fails his save, as does his intelligent life-stealing weapon, and they are turned into a mouse with life-stealing teeth. The cleric, aware he's suddenly been attacked by magic, is falling, and that a massive creature is moving next to him, attacks blindly. He scores a critical hit and eats the soul of his horse.
You must understand, this is 3 years of real-time, almost 4 years of game time, and he's had this horse the whole time.
The drow immediately targets the wizard for retribution. (Neither the cleric nor the cleric's player were stupid) The life-stealing mouse begins attacking the wizard fervently, rolling 19 after 19 until another party member casts Dispel Magic on the mouse-cleric who promptly begins to beat the mage about the head and shoulders with his life-stealing weapon.
The rest of the party dives into the fray. The paladin tries to grapple and fails, the psionicist's TK bombs, the fighters and rangers fumble and knock heads together and the other cleric, going last, manages to screw up and Hold's the paladin in place, providing a nice protective barrier for the drow. The bard tries a bit of magic but the drow's Rod of Absorption eats the spell.
The drow wins initiative and applies a massive whoopin' to the wizard, taking him to -3 hps. The drow drops his weapon and surrenders but promises that should the wizard do such a thing again he will not only kill him but will sacrifice him to his dark god and ensure the wizard's soul is tormented for a thousand years.
The rest of the party pretty much agree with the drow (except for the thousand years of torment in a few cases) and only apply enough healing to get the wizard up to 1hp.