Bubble in worrying about bubbles?

Seems everyone is talking about market bubbles these days. The Google Ngram chart below shows frequency of the words "market bubble" in US published English books over past 30 years. Its an understandable trend given recent financial crisis and earlier dot com bust. Still, since bubbles are rare and occur when few are worried about em, the increasing chatter bolsters my bullishness. via ngrams.googlelabs.com  

Seems everyone is talking about market bubbles these days. The Google Ngram chart below shows frequency of the words "market bubble" in US published English books over past 30 years.

Its an understandable trend given recent financial crisis and earlier dot com bust. Still, since bubbles are rare and occur when few are worried about em, the increasing chatter bolsters my bullishness.