WATCH OUT! WE GOT A BADASS OVER HERE!

[Urgh76]

Blitzing the Elite Four... with one Pokemon. Alternatively, getting through to the one-on-one (your rival's last and your last) and throwing it all in on a less accurate but more powerful attack... and scoring a critical hit. Better still if your handheld is down on its last legs of battery life. Then it gets epic.

This, and also taking out your rival's starter with yours every time :3

 

[mstieler]

An "oh crap" moment turned into a CMOA moment in Skyrim:

I play a Thief/Assassin-styled character, bow-at-the-ready. Minding my own business, sneaking around on a hilly pathway, and I turn a bend and there's a bear. Shoot a single arrow at it, and it takes off a tiny chunk of HP. Crapcrapcrapcrap FUS-RO-DAH! That should give me some time... wait, why did the combat music disappear? Where'd the bear go? Did it roll down the hill...? What's that brown rock down there? Nice. I just shouted the bear far enough off the ground to take fall damage high enough to kill it.

Also, talking to someone while watching my companion wreck house behind them, as Lydia decided to do on a pair of wolves that were going after a goat.

Spoiler: Oh, and teaching Mercer a lesson in Snow Veil Sanctum

So, I'd already done the quest on a previous character and knew what was coming, so I wound up baiting monsters to come attack, then backed up behind Mercer while stealthed. His stupid ass charges into a room filled with Draughr, and proceeds to get his ass handed to him repeatedly, while distracting the Draughr enough that I can snipe them out. "This lesson is over." Yup, that's right Mercer: don't screw with someone you can't beat.

 

[Elementary - Dear Watson]

The bit in the Darkness near the end when you suddenly become EPIC!

Also every level in Giants: Citizen Kabuto where you played as one of the giant monsters! After slugging it out as a little jet-pack guy, or the sword weilding wraiths, grabbing a giant and sweeping your previous team mates aside with single sweeps always felt godly!!

 

[w1ndscar]

One day I was at my friends house playing Devil May Cry 4 on his 360 and I was mashing buttons on the control in a room where you had to defeat a wave of enemies. Every thing was normal until Dante screamed, there was a huge flash and all the enemies on the screen exploded, and gave me an SSS combo. I still dont know what happened, but it was pretty bad ass. And I loved running around in TF2, and hitting people from across the map with the flare gun, and then getting a kill from it. Ive out-sniped a lot of snipers like that.

 

[Ekafme]

Chain Frost double kills on gankers in dota :3

 

[Wolf-AUS]

All I've been playing recently is Saints Row the Third.

So, basically the entire game

Clearing out the penthouse with "Power" playing in the background?

Awww yeah.

I second that as well.

Yes, that was brilliant. Can't think of anything else now, just keep going back to there

 

[The Funslinger]

That moment I fast traveled to that cmp outside of Skyhaven temple, to find an army of Forsworn waitning for me, even tough I had killed them not too long ago, then a dagon dropped in, giving me awesome music and an army of Forsworn and a dragon to kill.

That happened when I first went there for the quest. And it was my first Blood Dragon.

 

[Astiahl]

Assassin's Creed...all of it. You are essentially the Batman of whatever time period you're currently in...except you get to kill people. Nothing quite like the feeling of being surrounded by countless guards...and Hidden Blade counter-killing every last one, without fail...and then the feeling of joy as you hunt down any runners as you gleefully stab them in the face! ^.^

I feel AC brings out the well-intentioned psychopath in us all.

Also, playing Singed in League of Legends, that is all. *flees from entire enemy team with 100 HP after successfully backdooring a turret, causing another one to go to my team*

 

[Samurai Silhouette]

I used to take arrows in the face, then I took an arrow in the knee.

My achievement?
http://www.ustream.tv/recorded/336401
Meh

 

[BeerTent]

I picked up DoD:S after my clan disbanded due to it's release. I picked up the KAR98 and realized, "Shit son, I still have it."... Until I tried to melee with the rifle, that doesn't work too well because alt-fire is iron sight now. That's fucking weird. And my Carbine is gone now, which also sort-of-blows. You could say the bazooka guy has it, but then your stuck with the fucking bazooka.

Also killed this asshole [http://media.spiralknights.com/wiki-images/d/d4/Lord_Vanaduke.png] in another game. See that little knight down there? That fella's for scale, I'm roughly the same size.

 

[NathLines]

I'll take some recent examples:

The intro mission of Saints Row: The Third. Especially with a co-op partner.

The fight with Ra's Al Ghul in Batman: Arkham City. That was sooooo awesome. Countering 20 sandmen when they jump att you. Hitting a sand man and then catch a glimpse of reality. Such a well made boss fight.

 

[Spy_Guy]

Whenever I trick someone as a Spy, or I cause teamkills in Trouble in Terrorist Town.

...or I do stuff like this​

Spoiler: ...or have a round like this.

 

[shado_temple]

Retrieving the intelligence by myself, as an engineer in TF2.

That, and jumping out of a crashing helicopter, parachuting down to the top of an enemy tank, planting C4 on said tank, and escaping with a jeep from the enemy base in BF3.

 

[MrBenSampson]

-The All 4 Dead achievement in L4D1.

-Dominating 8 people in one life in TF2.

-Tanking the Harvester in Dragon Age Origins on Nightmare difficulty.

-Getting abducted by aliens in Fallout 3, and fighting my way out wielding Eugene firing 10,000 bullets.

 

[Dfskelleton]

In particular:
One time, I was playing Quake Wars: Enemy Territory, and I started driving the little "husky" vehicle or whatever it was called. I drove that thing at like 90 mph straight into an enemy stronghold. However, you're not allowed to enter enemy strongholds. I jumped off at the last minute, the husky kept going, went throught the barrier and exploding, taking a few strogg with it. It was amazing.
In general:
Those FPS games that have no cover mechanics and no objectives other than "Everybody dies". There isn't much more satisfying than knowing you just mercilessly slaughtered 60 demons/aliens/etc. without taking a point of damage.

 

[Gincairn]

Gettinga roadkill with the MAV in BF3, specifically because I feel it must be humiliating to the other player, they were killed by a radio controlled helicopter!

Anytime I use the typhoon in Deus Ex

 

[Vidi Kitty]

Monster Hunter 2, in the Training Arena with a Gunlance against a Tigrex (which is probably the most vicious enemy in the game). Low health, no healing potions left, less than two minutes on the clock. The Tigrex isn't showing signs of low health, either. Seeing it turn around in preparation to charge, I steel myself and charge as well. We meet halfway in the arena, me fully expecting to be killed by the monster. Instead, the lance goes straight into its head and kills it, completing the assignment. Best feeling ever.

Also, in the same game, completing the mission 'Four Horns' (kill a Diablos and Black Diablos in 50 minutes) with less than 30 seconds remaining. Good times were had.

NICE! I have suicide charged like that, but the best thing to happen has been a flinch from the wyvern. Most epic thing to happen with me is putting in headphones on my PSP with the sound all the way up and doing the los and ian arena challange with a friend. We had to drown out the sound of another friend who is not shy at all getting busy with his girlfriend, so no communication we go into the fight fully expecting to lose, and then laughing our asses off as we keep looking at each other frantically while barely dodging attacks and scraping out a win. Apparently we made it hard for the 3rd guy to perform...