I think someone actually TRIED to open the door because not one but TWO doors were open. We have a small room attached to the back of the house that was basically a closed in porch (we call it the mudroom - its where we drop our shoes and sports equipment.) The kitchen door is a metal storm door and the door to the porch is a large french door. Both doors were open. I might consider that one of the kids left the kitchen door slightly open and one of the cats pryed it open to get into the mudroom to watch life through the french doors... this has happened with lazy teens and bird-watching cats. But neither could cat open a door inward as was the case with the french door. SCARY. I am just so glad my boys were good and didn't run away!