A bubble means that your barber's telling you about his latest investment into Ethereum; explaining to you how wonderful immutable this Blockchain is while warning his baby dog "Vitalik" to stop begging. A bubble means that every single man out in the street talks about "Hyperledgers", "SegWit activation" and "PRISM".
That's the time when you should think about selling your Bitcoins or when a Mongolian horseman is telling his cousin in Kasachstan about trading cryptos; then but only then we are in a real BIG BUBBLE!
To end this short expertise of "what's a bubble like" and also because I do not want to decorate me with someone else's wisdom, listen to Clif High, one of the brightest minds I ever heard of.
