“Paradigm shifts are for people too stupid to spot trends.”
In addition to being funny, the quote makes a good point. A paradigm shift is just a major change in the way things work. An example might be Apple switching from the Power PC chip to the Intel chip. However, if you looked close enough Apple was probably dropping hints the entire time about wanting to leave IBM and go to Intel. Thus, most people viewed the switch as a paradigm shift. Whereas it was really a trend.