Déjà vu.
This commentary https://northmantrader.com/2020/02/05/market-soars-into-history/ brought me back in time to mid-March 2000.
We saw it recently with bitcoin and then cannabis stocks. It's like you know it when you see it. Of course FAANG has been going for a long time, but once your cab drivers and barbers start giving tips to buy Tesla and other high flyers it will be time.