San Antonio Opera’s 15th season kicks off with a double bill brimming with scandal. After giving birth to a bastard child, Angelica, an attractive, well-to-do youngster, is forced to become a nun. After seven years in the habit, Suor Angelica gets some wretched news from back home and (momentarily forgetting that suicide is a mortal sin) pulls the plug on her tragedy-filled life. Pagliacci (Clowns) takes a deep, dark look at how a certain comedia dell’arte troupe behaves offstage. Expect boozing, lying, cheating, and murder in this tragedy about comedy and the clowns who make it. If all this sounds like a bit of a stretch for little old SA, consider this: Both productions are led by seasoned regulars from the Metropolitan Opera. $36-$151.80, 8pm Fri-Sat, 2pm Sunday, Municipal Auditorium, 100 Auditorium Circle, saopera.com.