This reminds me of walking into the local pizza joint to pickup my order and everyone knows my name and calls me out. It's actually a cool feeling.

A young child's excitement

My cats.

Border collie puppies
Back and foot massages
Hugs
Smiling eyes
Spooning into a warm body on a cold night
Rain on dry land

Cats

My grandkids!
When I've been gone and my cat greets me at the door all stretched out waiting for belly rubs.
My sister's dogs rushing to see who can reach me first, tails wagging like crazy.
Nature!
When a favorite upbeat song comes on.
When I've caught myself doing something silly or stupid.
When I'm in a relationship (not now ) and I hear the text notification.
The morning I get in the car for the beginning of a road trip to anywhere.

Waking up in the morning and finding I'm still alive!