A single pinwheel spinning in a light breeze.
Having two positive thoughts in a row.
Riding a Ferris wheel, as long as there are no fireworks nearby.
A crackling campfire.
The celebratory feeling you get when you cancel plans, especially if those plans involved fireworks.
Birds flying in a V formation, but not too many birds that it’s unsettling.
A pretty good orgasm.
The idea of fireworks.
Sparklers are cool.