"Hey Pierce. How come there's a sign that says For Sale by your room?"
"My room's for sale"
"Really? Where are you going to live if it sells?"
"It's only for sale for a little while."
"Okay, well you might want to clean it up before you put it on the market."
Disclosure: Should you be interested in my 5 year old's room, you should know that it currently, still, has no power. Maybe we'll get lucky today?