I had a cat who used to get up on 2 legs (looked like a bear!) and chase my dog around. I never got a picture or video of it, such a shame I didn't because it was the funniest thing. He'd spread his front legs up and out and actually do a walk/run thing on his back legs. Hysterical.
He was, for more than a million reasons, one of the best cats who ever lived. I could write about him and his antics.