And then, remembering that moment on the train to Lucknow nearly 25 years ago, I felt less angry.

WSJ: One Cheer for Corruption in India

Mr Rogers's tale is less angry and less polemical than Mr Godwin's but in its gentle way it is just as revealing.

ECONOMIST: Zimbabwe

He seemed much less angry when he came back into the room, and particularly pleased when the guys he drenched came up the stairs yelling MY name.

FORBES: On Tumblr, Family and Friends Share Memories of Ambassador Killed in Benghazi Attack

"We must show the world that South Africans are no less angry at such crimes and make an equally loud statement of disgust, and protest in the streets, " he said.

BBC: Jacob Zuma (file photo)

By 2010 it was apparent that Texas Republicans were animated too, even if they had less to be angry about.

ECONOMIST: Texas and the tea party

Nearly half of those polled after voting in the Democratic primary -- a little less than half -- described themselves as angry, and Dean and Kerry each got about a third of their support.

CNN: Health care, economy seen as Kerry's winning issues

Book people want it to be less like a tablet, tablet people want to play Angry Birds.

FORBES: The Kindle Paperwhite is the E-Reader I Want to Buy

Putting all its angry eggs in one basket is a risk, but less of one than it used to be given the billions of devices in the hands of consumers.

FORBES: The Angry Birds Feature Film: It's Really Happening

For example, it may turn out that angry respondents are more likely to click on the initial link, but less likely to be interested in donating money (or signing a petition, or seeking out information that conflicts with their position, etc.) All interesting potential topics for future research.

FORBES: To Win People's Hearts, Make Them Angry

And in record time, too -- the first Angry Birds landed on Apple's iOS App Store in December 2009, less than three years ago, and has since become an international sensation.

ENGADGET: Angry Birds sequel 'Bad Piggies' launches tomorrow, we go hands-on