It just broke by itself
This cow’s face has guilt written all over it. It’s looking at the OP as if wondering how the trampoline upended itself, when everyone knows that Bessy had something to do with it. Cows don’t belong on trampolines. They belong in spacious fields with tons of grass and possibly a few puppies to play with.
We imagine this cow became angered with the trampoline after it didn’t send her flying 50 feet into the air. Out of frustration, the cow flipped the trampoline over and began stomping all over the metal frame. In a moment of clarity, it realized what it was doing, and right in time for the OP to snap this picture.