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.
There's these mountains near my old house that always feel like home. I remember just parking at the side of the road and wondering off into the woods. Find a giant rock out cropping and scramble to the top where I find a great little crevice to sit in. Loved sitting there looking at cool lichen and watching the winter storm clouds roll in.
I grew up near a small lake, and there was one such rock similar to yours my friends and I would sit on and just pass afternoons chatting outside on it.