Looking for a lively and interactive bit of theater? This playhouse may be the ticket. It is home to two long-running theatrical productions. Boston's longest-running production, Shear Madness debuted here in 1980. Since then, more than 5 million people around the world have seen the much-acclaimed whodunit set in a 1960s-era hair salon. Blue Man Group is a wildly popular production featuring three actors covered in blue paint who cavort about the stage accompanied by loud rock music and plenty of audience interaction.