About 12 years ago, my cat Liza, who I had just rescued, pushed the screen out with her head and took off down the street. She was at the time an indoor/outdoor cat, so I was not too concerned about THAT in peticular. However, she was pregnant and within a couple days of her 'due date'. It was scary until we got her back about an hour later. She was sooo big-bellied at that time, she could not move very fast.