Cory in the House/WMG

Kyle Massey, the kid playing Cory, knows that the show rocks

 * Except it doesn't rock.

Cory has a psychic power of his own
He makes everyone around him act like an idiot, and not notice that they're acting like idiots. This power was also in effect on That's So Raven.
 * He also uses the power to eliminate the indoor voice of everyone around him