Let's say it's doing something like this, and then it does something like this and goes like that. And let's say that this right over here is our C. And so, let's see, this is F of C right over here. That is, let me draw it a little bit neater. That is F of C, and it does look like the limit as X approaches C from the left. So, from values less than C, it does look like that is approaching F of C. But if we look at the limit as X approaches C from the right, that looks like it's approaching some other value. That looks like it's approaching this value right over here, let's call it L. That's approaching L, and L does not equal F of C. And so, in this situation, the two-sided limit doesn't even exist. We're approaching two different values when we approach from the left and from the right.