I used to have a little table in the hall, which was replaced with a small cabinet that has a glass door and glass shelves. We moved the table out, moved the cabinet in. I was sitting in front of it, cleaning the door and shelves with Windex. Cassie came tearing out of the bedroom - and clonked her head on the open glass door! I laughed so hard. I think she thought it was open, didn't realize it was glass. When I dust that cabinet now, I always put a dish towel over the door so she won't do it again and hurt herself. She was one leaf short of catnip that day!