When Isaac Newton was having a rest under an apple tree that made him so famous, he had no idea of how to do the anti-gravity lean like Michael Jackson without using effects of any kind. Moreover, even Michael Jackson himself had no idea of how to make happen. But the citizens of San Francisco know to to make gravity illusions possible even though they are neither world-known physics nor prominent dancers. As you might have heard before, Frisco is famous for its cultural sights and a wide range of entertainments, but what's more important, it has a lot of steep hills. So the authors of this video just wanted to make fun with them and all of a sudden got a terrific idea of how to make them work! Check out these positive people tilting the hills of San Francisco!