Some advertisements are incredibly effective even though they have nothing to do with what they are selling. If you are repeatedly shown two items together you will start to pair them in your memory. Just think about Joe Camel or Geico's Gecko, amazing characters that are memorable. I am a fan of conversational commercials. These are the commercials that are contraversal or start up conversation. I particularly like the Geico Cavemen campaign that is currently running. Other favorites that come to mind are the Budweiser frogs and geckos. What are your favorite commericals?