What happened / happens so fast that you can’t fully process it and wish you could slow it down and stay inside the moment more? Could be a specific moment - like making the big catch in a game - or an ongoing activity.
Besides obvious physical sensations I would say ***playing a guitar lead ***- if I think about it too much, I lose my groove; but if I stayed “in the moment” while playing, I often barely recall what I played or the sensation of playing it.
It’s like the Heisenberg Zen Uncertainty Principle - if you were in the moment, you can’t recall it; and if you can recall it, you must not have been fully in the moment.
This answer will get old fast, but I wish my kids would stay young longer.
I still remember the oldest (now 24) when he was young, and while I fiercely love the man he’s become, I sorely miss the little boy he was. Same goes for all of my kids.
You know that early morning sleep where you are kind of awake but not really and you know you will have to get up soon but you still have another hour or so before you have to get up? Yeah that feeling of goodness of, “Ahhhhh I get to lay here all comfy and warm and safe in my bed for awhile more. Mmmmmm.” That feeling should last at least 10 times longer.
This explains why I have never had any real memories of having sex with any of my partners. I mean, I can remember* facts* if something stands out, but the actual feeling of it all? Nope. I’ve always considered this a good thing, though; while I’ve had a lot of great times, it would feel kind of sacrosanct to relive them all the time.