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.
Aw, thats really sweet!