I love this grammar meme about as much as I hate it when writers mix up there, their, and they’re.
Although this trick isn’t always right, it is about 90% of the time.
Sure, it seems below the belt, but most of us would do anything to win an argument. O.K., it’s totally below the belt. And obnoxious. But I’d still keep it in your quiver for an equally obnoxious opponent.