Yesterday we had the back door open to let the dog out. My roommate was standing in the doorway and I'd gone to get something from the kitchen. I come back and realize the door's still open and my roommate is now watching the roof. I come over and she looks up and says "someone's being naughty..." Sure enough, there's Hennessy, out on the roof! I come to the door and he looks up, freezes, and then raced back inside.
I love how he didn't care if my roommate knew he was there... but the second I found out...