I find it hilarious when I see a commercial for a drug or supplement and it mentions a "clinically tested key ingredients" without saying the results of those clinical tests or what the key ingredients actually are.

I don't know if it's accurate in every case, but if I'm gonna be honest my first thought every time I hear that is "and that's the sign that they're peddling snake oil. Rattlesnake oil, too, not the good stuff from China."