Figuring out aerial chains in Marvel vs. Capcom
The first time you donned disguise in Hitman and it worked!
Using the cardboard box to troll all the guards in Metal Gear Solid
The sound a rat makes when you shoot it in slow motion (Max Payne)
Collecting the last piece of the Triforce
Getting all the Chaos Emeralds and going Super Sonic
Taking down Metal Gear Rex
Beating Batman Arkham City on Hard mode
Getting the Silent Assassin rank in Hitman
Getting the Molerat Repellent Stick from Moira's Wasteland Survival Quest
Scolding the asshole who buys Pokemon RED and picks the Bulbasaur
Getting a kill streak of 20 in Assassin's Creed Brotherhood.
Holding up the White Balverine's head in Fable
Beating Mega Man 2 with the buster only (whenever allowed)
In Castelvania... the Triple Shot with the Boomerang... YEAH!
Tricking your foe into walking into your Lightning Screw Uppercut in Tekken
Listening to by Primus in Tony Hawk's Pro Skater 2
Collecting the Sonic figurines in Shenmue while listening to the shitty walkman music
Collecting the pieces of your brain after the ending of Assassin's Creed 2
Using Telekinesis to throw your enemies into the abyss in Legacy of Kain: Defiance
Watching all the "Address Unknown" segments in Max Payne
Somehow blasting your opponent off the stage with Link's Downward Thrust in Melee
Equipping Agni & Rundra and using the Devil Trigger in DMC3
Using Herbs for Medicinal purposes in Resident Evil 2
Making it to a checkpoint in Ninja Gaiden. It's Ninja Gaiden... don't set your goals too high.
Travelling to the End of Time in Chrono Trigger.
Waking up in the Hospital looking like the Joker in Saints Row 2.
Getting trapped on top of a gas station and breaking the glass below you to outwit Dead Island Zombies.