Whitey likes to sit in the laundry room window, probably because it gives a nice view of the neighborhood, including the small playground next door. It's the highest accessible window in the house, too, which means he gets to show off his Spider Cat skills.
Then along comes Oscar. He sat on the floor, meowed, checked the distance a couple of times... and Leaped. While Whitey lands gracefully on the sill, Oscar almost didn't make it and had to scramble with his hind legs a little bit, but he got there.
Whitey looked somewhat dismayed. "What's the little punk doing here? My ledge!" At least Oscar had the sense to behave himself, as I'm sure Whitey would have dumped him off the ledge given the least excuse.