What is the cheapest way you have ever killed a boss/mini-boss/tough enemy?

[Drake the Dragonheart]

What is the cheapest way you have ever downed a really tough boss or just a nasty enemy?

The best one I can think of is in super metroid, in the Draygon boss fight. There are 4 power nodes in the room that you can blow the covers off them. Basically what you do is let the creature grab you and fire the grapple beam into a power node and although you take damage as well, it fries him. Of course it does come with a cavet, if you miss, the creature will likely knock the crap out of you. Now what is odd about this is as far as I know the battle takes place mostly or completely underwater, so why isn't the entire room flooded with deadly electricity?

Another super metroid one-spore spawn: it has a massive blind spot where if you stay in ball form in either corner of the room, he can't hit you. I just love how really old games did things like that. But they also did things like have spikes on both the floor and the ceiling with rising and falling platforms (shudders)

Spoiler: Deus Ex

If you leave Jamie Reyes behind when you leave for Hong Kong, he will get you Gunther's killswitch so all you have to do is hit the space bar. Now that is a cheap way to kill a boss!

Castlevania: Circle of the moon-using the summon card spells to kill Dracula though that doesn't necessarily feel cheap, since if you aren't high level they aren't going to be terribly damaging.
Castlevania: Curse of Darkness: Well I use a holy attack that destroyed his first form in 2 shots, and then I just spammed force cannon on his demon form.

 

[DarkHourPrince]

Final Fantasy X: Undead Evrae. Throw two phoenix downs and the battle is over.

 

[Burst6]

Demon's souls false king.

I basically walked in the boss room and hid behind a wall. The boss fight was initiated, and the king walked forward to confront me, but he couldn't see me. Before he reached the wall i hid behind, he stopped and turned his back to me like an idiot. I just snuck up to him and hit him with a poison spell. He had no idea he was hit and just kept staring forward. 15 minutes and several poison spell refreshes later he died.

 

[the_pleasure_is_mine]

The final boss of Final Fantasy 10....

Cast Zombie... attack twice... he tries to heal himself with Curaga and kills himself.

 

[bloob]

boarderlands, just sat out of range of his turret and used my sniper to kill him

 

[AngloDoom]

Cheapest way I killed:
Got stuck in a wall with only my gun pointing out in one particular game (no idea what) so I just kept on firing until the level was complete.

Cheapest way I was killed:
Fighting some giant golemn...thing on Soul Calibur III. No idea what happened, but while the "3...2...1..." was counting down to the fight, the statue just fell flat on it's face and took my entire health-bar with it. I wasn't even able to move yet. Reloaded and it never happened again.

 

[Evil the White]

I placed a LOT of explosives where the boss spawns. It's why boss fights should not take place when you have a chance to see their spawn before they appear.

 

[Lucane]

Claymores against Vulcan Raven in the cold storage area of Metal Gear Solid.

 

[Vinylsiding]

In Blaster Master for the NES you could throw a grenade then pause the game and the explosion would continue doing damage to the boss, or whatever else you wanted to throw a grenade at. It was cheap as hell, but it helped when my health got low.

 

[Draithx]

Killed Kraidgief in IWBTG by exploiting a glitch that makes you immortal for that boss only.

 

[DMonkey]

Walled Diablo in Diablo 2. All of his attacks went into the corner I have him in, and I was free to spank at will. Could have left something heavy on the left mouse button so I didn't have to sit there as I slowly whack through his HP, and gone out for a smoke, but hindsight is 20/20.

 

[Trivun]

Final Fantasy X: Undead Evrae. Throw two phoenix downs and the battle is over.

Dammit, ninja'd completely. However, there's an even cheaper one in the same game. When you face Yu Yevon at the very end, right after you kill all the aeons he jumps into (during which you literally cannot die as all your characters have Auto-life), you can actually turn him into a zombie and use a Phoenix Down on him there and then. Rikku has a weapon in my current save file with Zombiestrike, and since she's my second fastest character she almost always gets two turns straight after each other anyway. So yeah, instakill right there.

Oh, and thanks to a glitch the last time I played Kingdom Hearts, during my fight with Captain Hook, after I attacked him once he was frozen in place spinning on the spot (like the Goldeneye glitch). So after the remaining Heartless were taken care of, I just kept whacking him with no consequence until he was down. Easiest boss ever on that game, thanks to the glitch...

 

[glodud]

Oblivion: shivering isles, when Sheogorath attacks jump on a tree and use arrows and fireballs, he can't reach you

 

[Glademaster_v1legacy]

Seriously no ones has said this? The End in MGS3 I made him die of Old Age. Can't get much cheaper than that. Also I used Yojimbo in FFX to 1 hit kill every boss.

 

[Pearwood]

Flame Lurker in Demon's Souls. The guy has such bad pathfinding he's basically saying "please trap me behind something while you zap me"

 

[Rooster893]

I don't know how I managed to it, but I somehow backstabbed a enemy Heavy on TF2. I was right behind him, but apparently I was too obvious and he turned around and spooled up his gun. Knowing I was going to die, I wasn't going to go down without a pathetic attempt of a fight. So, I whipped out my knife and slashed. Apparently that was good enough to earn a backstab, and that's exactly what happened. But guess what was waiting for me when I finished the kill? A crocket. What a GREAT way to die.

 

[The Rogue Wolf]

Undead Dr. Ned in the first Borderlands DLC. He got me once, but I respawned outside of his cavern, and when I made my way back in I found that he'd gotten hung up on an outcropping of rock. Cue bullet-spam to the face. VICTOLY!