Sometimes, Wesley could sense magic. He had a little bit of an ability with it when he was alive, and now, as a ghost, you tended to be connected to the supernatural. When he felt something going on in the laundry room, he couldn't help but get curious, Sometimes, when you were a ghost, you had to make your own entertainment.
When he popped into the laundry room, the first thing that he saw was dancing laundry baskets. "Well, this is an interesting change," he commented.