The bastard part I'm used to. But hardly lucky. I played Reshevsky too with the same results. Sammy was gracious (also a lot older), Bobby thumped the table and glared "Why doesn't this idiot just resign and quit wasting my time" was what he seemed to be saying.
I'll never forget it, but it isn't a fond memory. I was about 16 at the time.
In summary, I drew Korchnoi and beat Larry Christiansen.
I suspect these guys have some formulaic set of variations they play in simulataneous exhibitions, so thye can make most of the first 15 moves mechanically. Maybe you took him off the beaten path, and he had to think, and that's what annoyed him.