Courtesy of James Lipton:
From the text:
Listen to his laugh. It resembles the flat "Ha! Ha! Ha!" that appears in comic-strip dialogue balloons. But worse – far worse – it is mirthless. Mr. Romney expects us to be amused, although he himself is not amused. Freeze the frame, cover the bottom of his face with your hand, and study his eyes. There’s no pleasure there, no amusement. Genuine laughter is triggered only by, and is completely dependent on, shared perception. That’s why we say we "get" a joke.
The Dish 