A good laugh may be good for the heart.
A team of Maryland medical researchers found that people with heart disease were 40 percent less likely to laugh in humorous situations than those with healthy hearts.
"The old saying that laughter is the best medicine definitely appears to be true when it comes to protecting your heart," said Michael Miller, director of the Center for Preventative Cardiology at the University of Maryland Medical Center.
It is uncertain, however, whether humor helps prevent heart problems or if people with heart problems tend to lose their senses of humor.
The study of 300 people showed that people with heart disease were much less likely to even recognize humor. They also laughed less, even in positive situations, and generally displayed more anger and hostility than people with healthy hearts.