A prominent billionaire investor is sounding the alarm on what looks like classic bubble behavior. Sure, there's a feeding frenzy around AI plays right now—everyone's piling in, valuations seem detached from reality, and the hype machine's running at full throttle. But here's the twist: beyond this surface-level mania, there's something darker brewing in his mind. He's wrestling with a bigger, more fundamental anxiety about where all this leads. It's not just about overheated markets anymore; it's about what happens when the music actually stops.