Crazy Cats

I know of a lot of people who have cats and at certain times of the day they go crazy. Stanley, for example, will start running up and down the stairs and meowing like crazy. Then when I go to see what is wrong he has his ears back and this crazy look in his eyes. He was doing that this morning and I don't know why. Please leave a comment if this has happened to you or if you know why they do this!