What sounds good on paper or in a Powerpoint presentation isn't always what's best for business, as several companies have learned when composing guerilla-marketing campaigns. A number of tech staples have learned the hard way about pulling off such stunts—garnering immense backlash from the public, while causing massive detriment to the brand name. The saying any press is good press doesn't apply to these primetime tech players. Learn a lesson in advertising etiquette by studying these 10 Terrible Marketing Stunts by Tech Companies.