I guess the only rule here is nothing super huge, gotta be something small that you still look back on from time to time.
One of mine, and the first that comes to my head, is this one time I was in rural Ireland. There was a pasture full of cows next to a church my group and I were at for a wedding, and while waiting for things to start I got drunk and bored. Decided to get up close to the cows since I'd never seen one in person before that close.
Cow came up to me all friendly like, started licking my face, nibbled on my tie a little bit, and then I backed away. Not before getting a sweet pic of me an the cow kissing tho.
I named it Gertrude.
one time i was sitting on the porch looking at the woods behind my apartment thinking about the impermanence of the world, then a massive tree just fell over in front of me
another memory from the same porch is watching a little squirrel bringing leaves up a tree to repair its nest and it followed the exact same path every time
squirrels are really good at figuring out optimal paths it turns out
solving the travelling salesman problem by just using a squirrel