The Clinton Area Showboat Theatre kicks off its summer season with two similarly themed shows running in repertory, and I caught a double-feature of Nunsense and Altar Boyz on Saturday - a marathon day of Catholic humor. The pairing is a good choice, with each offering a self-aware musical featuring jokes related to Catholicism. And while the scripts push the boundaries of Christian decency, neither crosses over into completely irreverent territory, each maintaining a respect for religious roots and having fun with the shows' core faith, rather than at its expense.