The prudent guys in the '20's who got out before the crash, had a saying: "when you start getting hot stock tips from the kid operating the elevator, it's time to get out." Maybe when some nitwit acupuncturist starts to think she's a real estate magnate, it's a sign that the bubble is about to burst.
Of course we used to have a bunch of boomers around here who insisted that a housing bubble was impossible. Haven't heard much out of them lately...wonder where they all went.