Or something that came up while channel-surfing on TV and decided to leave it on for a minute, put the control aside, and ended up watching the rest.
Back while in high school, one weeknight I stumbled across Jean Luc Godard’s “A Bout De Soufflé” (“Breathless”) on our town’s local channel, at just the right moment when it seemed like the film was skipping. Intrigued, I left it on, soon enough figured out that this was intentional editing. By the end, my mind was blown and my way of looking at film and art had changed forever.