Luckily Sunny and Storm have never attempted to go outside. Pepper has a few times but it doesn't take him outside. My door leads into a hallway. A few times he ran out the door and I didn't even notice until I heard a loud meow in the hallway. I opened the door and there was Pepper. At least he knows where he lives. He hasn't tried this for quite some time. Maybe he's finally learned his lesson. I'm so glad that you were able to get Rocky back inside. Hopefully he'll learn not to do this in the future.