Playing halo for the first time. My mom didn't like the whole violent killing thing, but it was okay because they were screaming aliens and the blood was blue. I didn't know much about games, but stepping out of that escape pod for the first time on halo shocked me. Like "Oh wow, it's an actual world within a disk". I still love the story, but nothing will hype me up like the beach landing. That was probably the peak for me.
Unfortunately it's been all downhill from there. Some games like blockland and roblox have had a significant impact on me, there are a number of games that i remember distinctly because they were fun or creative.
Roblox: Soul wars, Downhill Derby, Ride a cart into a Zombie, Reason 2 Die, XXX_FEARS's weird ass bases.
Blockland: Jaguars dogfight. Gravity cat's old buggy ass weapons, hell most of Gravity Cat's stuff was cool, Government Vs. Rebels on the GTA map especially. My first time experiencing Heedicalking's canyon war.
And the best moment: Badspot telling a kid that if he literally killed himself in times square, no one would bother to bat an eye. Years of rage mustered into a single suggestive comment that completely shattered that kid's future. I was laughing for a good 10 minutes. Repeatedly reading the comment. What a night that was.