Marketers, be warned: The Internet never forgets. Should you fire off an insulting tweet or an offensive burp of ad copy, accidentally or not, people will see it, save it and try your brand in the brutal court of public opinion.

Five big-name brands learned this lesson the hard way this year, carelessly tarnishing their reputations and fanning a firestorm of negative publicity in the process. The bigger they are, the harder they fall. From sexist ads to a QR code that -- whoops! -- directs to a porn site, here are the worst marketing fails of 2015


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