Running from the Abominable Snowman in Crash Bandicoot 2
Finding out that the original Xbox and game set that my parents claimed to of bought for a family friend was actually for me, and it was waiting for me on my birthday soon after
Playing through Resident Evil 4 for the first time. Such a great game!
Beating Resident Evil 5 on Professional, then immediately after earning the "Lead Aspirin" trophy, which gave me a platinum trophy for beating the main game on 100%
That one time on Friday the 13th my nephew glitched as Chad and floated around the map in a sitting position
Playing through Virtual Cabin, especially the parts where you get to resurrect Jason, get attacked by kid Jason and unveil Jason X, etc.
Finally beating the PS1 Atlantis: The Lost Empire game after literally being stuck on the next to last level since I was six. I found the game about a year ago in a stack of discs, popped it in, and beat the whole thing in about four hours. I used this great thing I only had dial up for back in the good ol days called the internet and found out on one level in particular where you swim under water, you have to punch these giant clams to get air bubbles so you won't die. It took me 14 years to figure that out, and boy was it satisfying when I did!
Using "The Movies Game" to make Youtube videos with misleading titles (gorillas robbing banks, etc)
Playing around with the AI versus mode on that Revenge of the Sith game apparently only I liked, where you can fight against alternate reality versions of Vader, Dooku, Windu, etc.
Playing through Red Dead Redemption on Story Mode. Whole game was so great!
Beating Tony Hawk's Underground
Unlocking all the secret characters in Pro Skater 3
Playing Nazi Zombies on Call of Duty: Black Ops 1
Playing Mario and my parents teaching me all the shortcuts to make it to the end faster on the NES. I've still never beat the last castle, but I have been to it.