Though it is illegal for pranksters to shout about non-existent fires in a theater, shrieking after an encounter with an underseat gum wad is permissible. Shout about what’s on stage instead with today’s Groupon: for $20, you get $40 toward a 40th anniversary show at the Invisible Theatre on North First Avenue. Patrons receive a $40 Invisible Theatre Gift Certificate that can be used toward any regular-season production. A local nonprofit, the Invisible Theatre celebrates its 40th anniversary season by building on its origin as an arena for local playwrights with a lineup of original and Off-Broadway shows. Spectacles leap off the stages of the intimate 80-person Invisible Theatre and the Berger Performing Arts Center on the campus of the Arizona State Schools for the Deaf and the Blind. You get your choice of four regular-season shows:

• My Mother’s Italian, My Father’s Jewish and I’m in Therapy! on January 15–16 at the Berger Performing Arts Center ($42)
• Miracles on February 2–20 at the Invisible Theatre ($25)
• Painting the Town Red! On April 9–10 at the Berger Performing Arts Center ($42)
• Premiere! on May 4–22 at the Invisible Theatre ($25)