If I hear one more person say, "Tulip Mania"... For the last 4 years, every time bitcoin starts to accelerate, that's what people say. Tulip Mania actually only lasted for less than 5 months (Mid November 1636- Early February 1637).
I think a lot of people hope it is a fad that will crash since they missed out on the beginning, not realizing we are still in the beginning.