What happy people don't do.

Rabin notes the work of John Robinson, who finds that:

Although people who describe themselves as happy enjoy watching television, it turns out to be the single activity they engage in less often than unhappy people.

The study relied primarily on the responses of 45,000 Americans collected over 35 years by the University of Chicago’s General Social Survey, and on published “time diary” studies recording the daily activities of participants.

“We looked at 8 to 10 activities that happy people engage in, and for each one, the people who did the activities more — visiting others, going to church, all those things — were more happy,” Dr. Robinson said. “TV was the one activity that showed a negative relationship. Unhappy people did it more, and happy people did it less.”