In my opinion, what defines great fantasy is when the author comes up with a completely new explanation for perfectly normal mysteries.

Consider cars that backfire, and yet when you look outside, there’s no vehicle on the street? I believe that I have solved this mystery.

It’s the Knight Bus from Harry Potter’s wizarding world. Remember how it goes crack and jumps to another area of Britain altogether? Well, I’ve decided that the Knight Bus doesn’t just deliver silly wizards to various places in Britain, but all over the world. And those non-existant cars that backfire? Well, that’s just the Knight Bus apparating and disapparating.

Ta-da! Mystery solved.