Musical Closets: Wish Not Working Anymore?

As Mikey walked, slumped, to the principal's office, he wondered why his wish to not be bothered wasn't working anymore. The teacher shouldn't have bothered him as he watched his miniature TV. So why did she? He paused in the hallway, remembering that he still had the wishing stone with him. He took it out of his pocket and said "I wish ..."