Again, it's just a signifier. If you know the answer (or can explain a good guess!), you probably also know a bunch of actually-useful dark corners of the langu

Again, it's just a signifier. If you know the answer (or can explain a good guess!), you probably also know a bunch of actually-useful dark corners of the language. If you don't know the answer, you may still know all those other things. It's just one data point among many.