In recent decades, laughter has been touted as a possible cure for many ills, including cancer and heart trouble. But could mirth also be deadly, making the phrase "I just about died laughing" as much about accuracy as it is hyperbole?

On 24 March 1975, 50-year-old bricklayer Alex Mitchell of King's Lynn in Norfolk, England, kicked the bucket while roaring with laughter at one of his favorite television shows, the comedy program Pecos Bill, the legendary cowboy hero of American folklore, has him dying from laughter after an encounter with a Boston dude:

When Bill was gettin' on in years, a Boston man came down to New Mexico for a visit. He fancied himself a bit of a cowboy. Got himself one of them mail-order suits, don't ya know. The ones with the lizard skin boots, a shiny brass belt buckle, a new pair of blue jeans and a huge ten gallon hat with not a speck of dust on it. Well, when Pecos Bill saw him trying to swagger into a bar, he jest lay down on the sidewalk and laughed himself to death!

Not enough information was given in the (real) cases cited above to know whether laughter was a coincidental, contributory, or causal element of the deaths, but linguistically we've been tossing about "dying laughing" expressions for centuries; the Oxford English Dictionary records a use of this phrase as far back as 1596 ("Went they not quickly, I should die with laughing"). We also employ similar phrases to indicate intense feelings of humiliation ("I almost died of embarrassment"), and in a more generic sense we use 'dying' to indicate great longing ("I'm just dying to see you") or excellence ("It's to die for"). It therefore comes as a bit of a shocker to realize that there might be at least a smidgen of truth buried deep beneath all this overblown emoting.

Yet even if there may have been an occasional death from guffawing, it's still possible merriment is far more healthy than harmful (at least for the ones who survive). Some studies assert laughing produces beneficial effects on physical health, including decreasing the secretion of serum cortisol (a stress hormone) and boosting the blood levels of immunoglobulin A, an antibody that fights bacterial and viral infections in the upper respiratory and gastrointestinal tracts. However, not everyone in the scientific community has jumped on this bandwagon: in a study reported upon in 2002 in Current Directions in Psychological Science ("Is Laughter the Best Medicine? Humor, Laughter, and Physical Health) researchers reported that the connection between humor and wellness was "less conclusive than commonly believed" and that "future research in this area needs to be more theoretically driven and methodologically rigorous."