Our JSP server would crash but only when the moons of Jupiter were aligned and the bakery across the street was serving the blueberry scone (CNR with the ham & cheese)
Engineers train a AI model to play an old game. One day their AI performs worse, on multiple hardware. Turns out the game has extra logic when it's full moon. "The player character is luckier, werewolves appear in their animal form, and the dogs howl ominously"