Go to Los Santos International Airport, and use the "Spawn Jetpack" code to reach the top of the communications tower. Once on the top, there is a small circular platform with a thin platform around it, with just enough room to stand on. Stand on it, and make sure it is the border around the very top platform. Enable the "Spawn Rhino tank" code. If done correctly, the tank will spawn and immediately ricochet off the top and do multiple spins and somersaults in the air before finally hitting the ground below. This can be very funny if done correctly.