...is one I hear over and over when I listen to Air America. It tries to sell me a penis hardener which works for more hours than Viagra but doesn't take as long to work as herbal supplements! I'm offered my money back if it doesn't work, so I'm very tempted..
Anyway, the commercial touts some scientific sounding results: "In a medically supervised anecdotal study..." I love the cheekiness of whoever made this up. But it's still sort of wrong of course.