An excerpt from Wikipedia states:
Shock advertisements can be shocking and offensive for a variety of reasons, and violation of social, religious, and political norms can occur in many different ways. They can include a disregard for tradition, law or practice (e.g., lewd or tasteless sexual references or obscenity), defiance of the social or moral code (e.g., vulgarity, brutality, nudity, feces, or profanity) or the display of images or words that are horrifying, terrifying, or repulsive (e.g., gruesome or revolting scenes, or violence). Some advertisements may be considered shocking, controversial or offensive not because of the way that the advertisements communicate their messages but because the products themselves are “unmentionables” not to be openly presented or discussed in the public sphere. Examples of these “unmentionables” may include cigarettes, feminine hygiene products, or contraceptives. However, there are several products, services or messages that could be deemed shocking or offensive to the public. For example, advertisements for weight loss programs, sex/gender related products, clinics that provide AIDS and STD testing, funeral services, groups that advocate for less gun control, casinos which naturally support and promote gambling could all be considered controversial and offensive advertising because of the products or messages that the advertisements are selling. Shocking advertising content may also entail improper or indecent language, like French Connection‘s “fcuk” campaign.