I'll post a few good ones and skip over the bad stuff:
First experience on mushrooms was life changing and put me in touch with the universe. It is really hard to describe what that means.
Meeting Bret Hart and Mr. T.
During a soccer/football game in the semi-finals our team only had 10 people with no subs and I was the goalie. 80% of the game was played on our side of the field. During the last quarter the other team was down and they played full offensive, everyone except the goalie was on our side and it was a constant stream of shot attempts until the end of the game. It was raining and at night time, but we pulled through and won 2-1. I remember when the whistle blew I dropped down to lay in a puddle of mud/water completely exhausted. I was mobbed by my team shortly after.

We have the game recorded on vhs.
Winning a large 60 person MTG tournament and walking out with a ton of swag.
Anytime I'm around my 3 childhood friends, 25 years and still going strong.
Nate Diaz beating Conor Mcgregor. I fucking went ballistic.
Playing through Kotor 1 the first time.
Getting my first puppy, black and white border collie named Rocky. I miss him a lot but its a happy sadness.