Yes on both counts. In roughly 2013, the shared office building I was working in installed a BTC vending machine. It advertised itself with a graph showing BTC rising close to exponentially, with a strong implication that it would keep doing so, which immediately made me think “irrational growth optimism, probably doomed to bubble and burst”.

Had I spent £1k of spare cash then, I would now have enough to buy another house.

EDIT: And I’ve just now remembered that someone gave me £0.50 of BTC as a “thank you” on Twitter, which I sold to a friend for £25 and which is probably now worth £250.