The silence after a fruitful and thoughtful conversation
Watching deer/antelopes getting killed/caught by a big cat after a vigorous struggle
Watching documentaries about the fall in Wall Street in 2008
Observing a repeated cycle in a factory/workshops/machines/those things.
Getting a high-score in the Pinball game in a school PC
Getting a 100% win percentage in Solitaire
Watching Hyenas getting scared off by lions. #TEAMLIONS
Winning a(n unimportant) debate (i.e. road turns, name of a long-forgotten actress, levels of spicy wings)
Able to solve a crime in a detective novel before the main character solve it/a mathematics problem taught in high school 2 years ago about derivatives/an online click & drag mystery flash game/…/solving something.