After leaving the bathroom in his (hopefully) temporary clothes, Jon inspected the damage to his bedroom. It was bad and he didn't know how he was going to fix it. Unless he made a wish with the stone. He could return his room to normal with just one simple wish.
But first he had to find the stone. Thanks to part of the floor collapsing, the wishing stone was now somewhere in the garage below.
After going downstairs, he saw Dana talking on the phone. She covered the receiver when she saw him and said "I'm calling the plumber."
Jon nodded, then headed to the garage. Hopefully he'd the spot the stone right away.