Crowley: Gravity. It’s a thing that happens when objects are pulled together. In this case, they’re all pulled downwards because the Earth is the largest thing around.
Gabriel: Why?
Crowley: Uh, honestly, I don’t remember. Seemed like a good idea when we were all talking about it. So things will stay where you put them? Not just drift off?
Gabriel: But it doesn’t stay where I put them. Goes down. Except for flies. They go up.
Crowley: Well observed.