Quantum fluctuations are like the universe's equivalent of a teenager's mood swings.
One moment everything is fine, the next it's like, "NO, EVERYTHING IS CHANGING AT ONCE AND YOU'RE NOT GOING TO LIKE IT."
It's like the universe's way of saying, "Hey, you know what? I was just messing with you, and now you're not sure if you exist or not."
But don't worry, it's just the universe's way of keeping things interesting.
Or is it?