Peek a Boo sounds like an old creaking door... it took me and DH about 5 minutes to figure out it was the dog, lol! And only then bc we live in a newer house, or I'd still be swinging doors to see which one was creaking! That was about 9 years ago... even to this day, I have to stop and think 'What the heck is that noise?' whenever I hear him.
