The Voices In Sally’s Head

Sally hears voices in her head.
But instead of telling her to go wild, set fires and kill people, they tell her to go straight home and clean her room.
They even help her with her Chemistry homework.
“Boyle’s Law is pressure times volume equals a constant,” says a voice. “It’s Charles’ Law that involves temperature.”
Sally smiles, puts down the Chemistry book, and moves over to Physics.
Oh, sure… eventually they told her to burn down the school and kill her classmates.
Then they told her to go home and clean her room.
The cops didn’t find any evidence.