Medicine is science applied to the human body - and medical experiments are so complex and varied that things frequently don't turn out as hoped. And, just to add a touch of comedy, accidents in this field are often crotch-oriented. The most famous below-the-belt invention of modern times was Viagra. The drug was meant to help patients with angina, a painful heart condition in which the circulatory system constricts and does not get enough oxygenated blood to the heart. Although the medication failed to treat the disease, it had a side effect of increasing blood flow elsewhere.