Remember the T-Mobile ad that deployed Improv Everywhere in London’s Liverpool Street Station? What about Honda’s The Cog ad that really was copying video artists Peter Fischli and David Weiss’s The Way Things Go? It didn’t take companies long to figure out the incredible branding possibilities of viral marketing. eGuiders gives us the full story behind some such campaigns with their listicle of 8 Classic Viral Ads Explained. Our favorite is the crafty Ray Bans ad with the two dudes tossing sunglasses:

(via Urlesque)