Brown study

According to researchers at the University of New South Wales:

An Australian psychology expert who has been studying emotions has found being grumpy makes us think more clearly.

In contrast to those annoying happy types, miserable people are better at decision-making and less gullible, his experiments showed.

According to the BBC, the researchers found that dour individuals make fewer mistakes and can communicate more successfully than cheerful chappies. Personally, I'm skeptical - it doesn't seem to have worked for Gordon Brown...