When I came home from knitting group, I noticed a ladder against the front of the house and a window screen on the lawn.
The Fool was inside, making spaghetti and meatballs. I asked what had happened. He'd been working on the computer when he heard a bang and saw that Angus had unlatched the bottom of the window screen with his teeth (there's a little peg you pull on to open the screen) and disappeared out the window!
Angus was unhurt even though the window is about eight feet off the ground. The Fool found him sniffing around in the grass and picked him up to carry him back inside. When Angus saw the inside of the house, the Fool surmises that he was so relieved to be back in familiar surroundings, that he used his back feet to push off against the Fool and go leaping from his arms to the floor ... which left two big scratches on the Fool's chest and stomach.