Definition of Insanity

James Robbins, a start-up coach for 20 years, has a sign in his office that is captured by Prof. Bob Sutton in his book, Wierd Ideas That Work, Pg. 4, last line.

"The definition of insanity is doing the same thing over and over and expecting a different result."

A very deep thought. So how many insane people do I know? How many times have I been insane?