Two that come to mind:

• One that I still remember from high school. It was just a simple Counter Strike match. But it was down to me and one other guy. I switched to knife, turned the corner, there he was, going the other way. He didn’t see me. So I followed him, riiight behind him, around several corners, while chat spectated. Still never noticed. I finally knifed him in the back, chat erupted, I felt like a god even though I sucked at Counter Strike.

• Winning my first Rocket League tournament after years. It really felt like I’d done something that mattered.