Hi my cat is an indoor cat but recently he has learned how to pop the window screens out and even open up closed windows in certain cases. We try our best to be diligent about locking the windows when we go to bed or leave the house. But now he's gotten so brazen that he will sneak out the window when we are in the same room! I know he just goes around and smells then he tries to re-enter and is unable. He ends up meowing to notify us he wants to come back in. He knows he is not supposed to go outside. When I see him on the window sill I snap my fingers and he runs off. I just need some ideas to prevent him from doing this. Any ideas?