"The Substitute Spanish Prisoner"
Episode KH521
Original Airdate: 03/03/02

Peggy reconfirms her "genius" status, but goes overboard in the advanced degree department.

When Peggy falters while substitute teaching a math class, she begins to question her intelligence. She and Bobby find a site on the Internet that offers a free I.Q. test. Peggy passes with flying colors, and achieves genius status. Soon after, she receives an invitation to attend a seminar exclusively for "The 150 Smartest People in Texas." If she attends, she'll be able to purchase a registry that will contain her name as one of the hundred and fifty smartest folks.
At the seminar, Peggy is offered the chance to earn her PhD on tape for only nine hundred dollars. She is hesitant at first, but the lure of being called Dr. Peggy overwhelms her. She uses Hank's retirement/RV money to purchase the tapes. Hank, who already thought the whole seminar was shady, is now convinced it is a scam. Not to mention, his RV money is gone! His point is proven when Luanne takes the I.Q. test and also scores at genius level.
Distraught over being duped, Peggy goes on a personal quest to retrieve her money. With help from her fellow "doctors," she plots a master con that refunds everyone's cash. (Maybe she really is a genius!)