Does it have to be strictly combat?
Anyway, My characters have a knack to get other people to dive into water, fully armoured.
First time, it was my elven rogue during a fight on a ship. He just told one of the enemies to go take a cool, refreshing bath, the best thing to do in this heat, and the guy did it (of course, he was actually a fey'ri assassin who could do suggestion as a spell-like ability - meaning no verbal or somatic components beyond the suggestion itself). Freaked out the other party members, who had no idea that their elf collegue wasn't your average run-of-the-mill elf.
The second time, it was not my character with the spell-like suggestion. It was me. Another boat-ride (river this time), and a pyrohydra attacks the ship. After we talked the dwarf out of jumping on the thing to attack it (typical dwarf with full plate and everything, played by a RRPG newblood). So we beat the thing, and I say, jokingly: "Hey, dwarf, why don't you just jump in and look for treasure?" And he just goes "Okay" and does it.
I've been feared for my headology ever since
Another fun time was us interrogating a Red Wizard. He plays heroic, saying "Kill me, and you'll never gain the knowledge you so gravely need!" And my character deadpans "She's a cleric, she can Speak with Dead." That got him singing like a nightingale.
There's also the usual "summon big freakin' whale to smash up a bridge" (a small flower pot was summoned alongside, don't know why

).
Does spreading your dark wings, showing your glowing eyes, and telling some bloke that you're the Angel of Death, and that his name is on the top of your list, count? Because he did definetly not fight after that.
I also remember dropping the bad-ass supremist "I'm so great" ranger NPC who was so annoying, with a single stroke. It went like this:
DM: "You hear a familiar voice behind you: 'You have crossed us once too often!' As you turn around, you see the ranger with the bow pointed at you.'
Me: "Ini?"
DM: "Sure, he's on 23"
Me: "31"
DM: "What?"
Me: "That's right. I fly there and do my (whatever swordsage maneuver was hip at the time), does a... oooooh, natural 20, and a 17 to boot. Does that hit?"
DM: "Yes"
Me: "Crit! With the extra damage from my strike, the insightful strike, and the sneak attack, it all adds up to..... 101 points of damage."
DM: "..."
DM: "..."
DM: "... he's dead."
Me: "Alright."
DM: "He can't be dead! He's level 17!"
Me: "What's he doing on level 17 with 101 HP?"
DM: "Well... bleeding, it seems."
Another story from my Fey'ri (same character, different campaign): The guys he was touring with contained one tiefling wizard, follower of Talos. Well, when I say follower, I mean most favourite soul in all the Realms, as far as Talos was concerned. I think Talos got aroused each time he watched this guy. So much destruction. It was the best character for that player to play, becuase he could stop pretending to be someone else
Anyway, one fight the (spell-)trigger happy wizard smokes out some alley with cloudkill - only my character was in there (not that the wizard cared too much). One quick dimension door later finds my assassin on the rooftop, caughing his lungs out.
The next thing he did was see the wizard standing at the end of the alley, grinning like a maniac, and ring-of-the-rammed him in the nads. With sneak attack. He had the voice of an aasimar for a couple of days, but he learned not to peter off demon-blooded elves who were good at hitting places where it hurts.
Since we're talking about that wizard: He had a familiar. Well, not really. He only thought it was his familiar. It wasn't. He thougth it was a quasit. It wasn't. It was an imp telepath (another PC) who would plant psionic suggestions and mind messing into his "master"'s head all the time. The wizard eventually catched a whiff of rodent, and we thought he'd fry the quasit/imp. He didn't.
So the campaign's practically over, the DM tells us what course our future will take, when the following conversation took place:
DM: "..And finally, your Imp will turn into a pit fiend who will have a whole nation as his mind-thrall and..
Wizard: "So it's over? I power-word-kill my "familiar."
Familiar: "WHAT?"
Wizard: "Surely you have less than 100 hp."
Familiar: "I erect my defenses, I now have Spell Resistance against mind magic.
Wizard: "How much?"
Familiar: "24"
Wizard: "Don't even have to roll, bye bye."
Familiar: "You guys will raise my character again, right? He's to become a pit fiend!"
Me: "I spit on the devil corpse. Filthy order-spawn. I say we let the little bugger rot right there"
Everyone: "Alright!"
Familiar: "Damn!. I was so close to true power."
Wizard: "Well, level adjustment's a killer."