Ghost wisdom. The wisdom passed down from ghosts of past, present and future.
Night Janitor: What's that noise in the girl's locker room?
OH, GOD! How did the Coke machine get moved in front of the stall? Who turned on the fucking showers?!
Blonde girl Poltergeist: It's meee. Tee Heee.. and now you die.
Night Janitor: Lord, save me from her wicked gisdom! Those damn Wiccan kids must've done this.