One day, while my wife was home alone, she logged onto our computer, which at that time was in our bedroom.
All 5 of our kids were at school, and it was mid-afternoon, so she decided to do some web searching. She was checking out some of her favorite craft websites and collecting patterns for quilting projects when she heard the front door open. In the back of her mind she thought it was a little early for any of the kids to be home from school, but occasionally there is an early release, so it was not unheard of to be home a bit early.
She heard the door close and footsteps walking through the house, rounding the corner into the bedroom and stop right behind her. She turned around in the chair to see which of the kids had come home.
There was nobody there.
All 5 kids began to filter home about an hour and a half later.