When it does that thing, it pours

Can we settle this once and for all, please?

• Rein is what you put on a horse, so you’re reining someone in.
• Reign is what a king does, so he’s the reigning monarch.
• Rain is that wet stuff that falls from the sky, so it’s raining cats and dogs.
• And yes, Claude Rains was awesome in Casablanca.