We have 1 minus, so we're not going to calculate the entire expected value, I just want to calculate what happens when we do what's inside the expected value. We'll have 1 minus 0, so you'll have a 1, times a 3 minus 4, times a negative 1. So you're going to have 1 times negative 1, which is negative 1. And what is that telling us? Well, it's telling us at least for this sample, this one time that we sampled the random variables x and y, x was above its expected value when y was below its expected value. And if we kept doing this, let's say for the entire population this happened, then it would make sense that they have a negative covariance. When one goes up, the other one goes down.