If the earth was flat, then the positions of the Sun and Moon would not change and the ocean would not have waves because no gravity between Moon and sea.
If WW2 was fake, then we wouldn't have artifacts from it nor Masonic Archives
If nukes weren't real, Hiroshima and Nagasaki would not have been bombed and we would not have Alcatraz detaining the Japs.
Here's an alien-looking caterpillar for you though!