The Tulip mania of the 17th century.
What started the mania?

I'd say that the value of bitcoin will rise soon to unexpected heights and unsustainable heights once again. It will fall as the height of it will cause by the supply and demand. Most user's who start with crypto want to hold and then after some time are selling off they're btc to get into other things. I would argue that at the current course and steady new supply of new comers the value is due to spike. After all tax return season is coming soon in the US. Pay close attention to coin base, and other US based bitcoin platforms in March.
-Samuel