Family Affair - Season 5 Episode 14 Feat of Clay
Overview: Bill's new girlfriend gives him a genuine primitive Colombian artifact, in which Buffy and Jody take to school and to have it broken! They try to put the pieces back together again and uses clay to make an exact copy of the statue. Their handiwork is displayed at the gallery and people are trying to buy it. The kids confess their doings to Bill's girlfriend.