“It's the surprise, the unexpected, the out of control. It turns out that laughter is the only free emotion--the only one that can't be compelled. We can be made to fear. We can even be made to believe that we're in love because, if we're kept dependent and isolated for long enough, we bond in order to survive. But laughter explodes like aha! It comes when the punch line changes everything that has gone before, when two opposites collide and make a third, when we suddenly see a new reality. Einstein said he had to be very careful while shaving, because when he had an idea he laughed -- and he cut himself. Laughter is an orgasm of the mind.”