Laughing until it hurts is unquestionably a great thing. Countless studies have highlighted its wondrous health benefits, which include bolstering the immune system, increasing blood flow and oxygen intake, and helping control blood sugar levels. One oddball study even seemed to demonstrate that laughter can help increase a woman's fertility: Would-be moms undergoing in-vitro fertilization who were entertained by clowns (hey, whatever works) had a 36 percent chance of becoming pregnant versus a 20 percent control group.
Turns out, you can die from laughing too hard - The Week