Of course, Netflix, Tesla, and SolarCity are at the far end of this scale. All of these stocks trade at valuations that are so rich, skeptics argue they probably can't be realized, ever.
But that doesn't mean they're going to decline anytime soon. "These stocks are trading on dreams," Cramer said, "they're trading on the promise of tomorrow." And as long as they allow investors to dream, Cramer doesn't see these stocks tumbling either.