Take a walk down the street and count the number of advertisements you see. With so many brands and companies competing for your attention,advertisers have to work harder than ever.One popular method of engaging consumers is by holding competitions where consumers come up with their own commercials or slogans. These have proven to be successful,and do increase the number of people who come into contact with the brand. But allowing strangers to be active in a brand's identity can lead to great problems. Here are two cases of advertising gone wrong.