[0] https://en.wikipedia.org/wiki/World_Online
Edit: you say 2 years... But people bought this one as well by the millions in those days; https://www.google.com/search?q=kpn+koers&oq=kpn+koers&aqs=c...
That never recovered. While 'everyone' agreed that could never happen as this time there was no roof. And for a brief moment almost everyone believed that.
As a less localized thing; in the tech community, stocks of for instance Borland/Inprise were talked about in the same way. I don't think (but cannot find info fast) they ever recovered.
I wonder if High-Frequency/Algol trading has anything to do with our current bull run. Maybe removing some of the human response from the equation has stabilized the market to some extent.
That being said, I'd be VERY surprised if a recession does not occur within the next few years.