Where every decision splits the universe into an infinite number of parallel worlds.
Or does it?
Imagine you're in a restaurant. You order a sandwich, but then you realize you could've gotten the salad instead.
Now you're in two worlds: one where you got the sandwich and one where you got the salad.
But what if you got the sandwich in both worlds? Or neither? Or what if you're just a sandwich?
What if you got the sandwich in both worlds?
What if you got neither the sandwich nor the salad?