Ads that provoke are the ones you remember
When I design online ads for American Apparel, I almost always look for an angle that will provoke. Outrage, self-righteousness, and titillation all work equally well. Naturally, the sexy ones are probably those you remember most, but the formula worked for all types of images. Photos of kids dressed up like adults, dogs wearing clothes, ad copy that didn’t make any sense—all high-valence, viral images. If I could generate a reaction, I could propel the ad from being something I had to pay for people to see (by buying ad inventory) to something people would gladly post on the front page of their highly trafficked websites.
Drugs are the product of a complex evolutionary game. As fungi and plants evolved, some developed chemicals in their leaves ...