I usually keep a few windows open, and I thought my screens were secure. Last night it got too quiet in the house, and I could only find Blossom. Spock and Bitsy were nowhere to be found. I checked the window, and the screen was pushed out and Bitsy was sitting on the front porch. I got her inside and went looking for Spock. Finally I found him and the neighbors cat hissing and growling at each other under the bushes. He wouldn't come to me, and I ended up chasing him through two neighbors yards before he let me catch him. Now I'm afraid to open any windows.