Ask HN: Have you ever had a "middle-out epiphany"?

In S01E08 of Silicon Valley, during a certain scene about phallic physics, the founder of Pied Piper suddenly has an epiphany about "middle-out compression", leading to the revolutionary compression algorithm that ends up saving their arses and getting them funded.

Have you ever had a groundbreaking idea come to you like an epiphany, all at once - as opposed to gradually through deliberate brainstorming - that solved a major technical problem for you, and what was it?