Well, the cat on the floor suddenly rolled onto his back, grabbed the sofa cushion hanging over the side of the sofa, and proceeded to drag himself along the floor upside down by shinnying along the cushion with his claws. Then he reached the end, let go, rolled back over, and ran off into the kitchen. I think this is the weirdest thing I've ever seen him do, even beating out the time many years ago when he insisted on running up and sticking his head through the slats of a venetian blind no matter how many times I pulled him out and shooed him away.
I didn't realize he was that hard up for entertainment around here. I guess I should start leaving the TV on for him or something.