This trick won't work for every building, but if it does work then the entire building should fall down all at once! Park your vehicle right next to a building or between 2 buildings so that the driver won't be able to get out. Press and hold the "Z" button. The driver will screem, "Doh!" several times and then the building will fall down. If instead of getting "Doh!" you get "Try something else," the trick won't work on that building.