Report Falling through the bottom in Aerodynamics, Mechanics, or other... Posted December 8, 2014 + 1 to Flying pigs theory. I have seen this happen when it is sunny and in an auto over different color terrain below 100 feet. It can be a very stable condition so that each time we did an auto it was reproducible and predictable. What were the conditions when you experienced this? Try doing it on a cloudy day or near sunset and see what happens.