Write a story that seems normal on first sight , except for one small detail that makes it extremely creepy on a more careful reading [ WP ]

Moving day was going to be a chore. Matt looked out at the rows and rows of boxes. Some to be donated, some to be thrown away, and others to go to their new home. It would be worth it though. The house they were moving from was huge, and they did n't really need all that extra space they were paying for, not since their eldest son Luke had moved in with his friend. 
 
 Their youngest son Mark sat playing on his playstation. They'd chosen to keep that plugged in until the last minute to keep him distracted. Mark had been a little quiet since the night Luke moved out, although he did seem to perk up a little when he had that little headset on so he could chat with his friends. Matt often heard him muffled through the wall. 
 
 His wife Mary had been a complete scatter brain while they'd been packing. She kept moving boxes from the trash and donate piles to the moving pile. Or even stranger, to a corner of the garage. The new owners would be here the day after tomorrow, and Matt doubted they'd have much use for boxes of old jeans and cd's. 
 
 Matt loaded the boxes into the truck taking extra care with the family portrait. He'd noticed the glass in the frame had a tendency to shift around when he'd picked it up the week before and he did n't want it to break on the way to their new home. He had a place picked it out for it, right in the entrance way. He could n't wait for all his friends to see it at the housewarming on Sunday evening. 

