Now that BB is mobile, like disappearing in mere seconds mobile, we have started shutting the doors to our upstairs rooms - specifically the bathroom.
The only problem is that now when I go upstairs and see a closed door, I think someone's hiding in that room. I catch my breath. My heart stops. I start to turn and run down the stairs. Then I remember, "Oh, yeah, I shut that door. There is not a serial killer hiding in the spare bedroom. Whew."