Hard to get past this first one:
10. Anafranil (clomipramine)
Anafranil is an anti-depressant that causes people to have orgasms every time they yawn. Yeah. No joke. A 1983 article in the Canadian Journal of Psychiatry found a case of a woman in her twenties who came every time she yawned! She even used it to her advantage: “She found she was able to experience orgasm by deliberate yawning.”