Livvy and Cassy run around the house periodically, but somehow at least one of them has trouble in the dining area. (Cornering around the table legs perhaps?) Rumble, rumble, rumble through the house then into the dining room and 'thuddy-splat' or 'thuddy-thud-splat'.

Cats -- you gotta love 'em. (If I every get really rich, I think I'll get the furkids to a psychiatrist for cats. Maybe there's an explanation for their precious weirdness...)