Riley looks just like this when he's grabbed his favorite boingy-boingy toy in his mouth and tries to walk off with it before getting pulled back by the elastic cord.

Just now David was playing with him upstairs and we had a case of "wacky cat" right on the bed. Riley went completely spazzy for the toy, and we were lounging at either end of it just laughing hysterically at him. Then he collided with the laptop and decamped for the relative safety of the floor. Funny little kitty!