Added by on 2014-01-20

An IQ test proves Maggie to be smarter than Lisa. Shocked that she is no longer “the smart one”, Lisa runs away from home.
The Simpsons go on a late-night attic search after Bart and Lisa begin hearing voices — and find Marge’s ex-prom date Artie Ziff, who’s on the run for cheating the shareholders of his company.