General Motors (GM) did everything right with this print ad. First and foremost, the ad was actually funny. It features a Chevrolet Volt coming out of the closet to his gas-guzzling parents, announcing: "Mom, Dad, I'm electric." The ad ran in Between the Lines, a Michigan LGBT newspaper, during the Motor City Pride festival in June and cost the Detroit-based auto manufacturer just $750. GM got even more bang for its buck when the ad went viral. According to the Detroit Free Press, it had an estimated 11 million views on various online social media. That's roughly 14,666 potential customers for every dollar GM spent.