The final season of Parks and Recreation wouldn’t feel complete without one last visit from Megan Mullally as Ron Swanson’s deranged ex Tammy, and when we caught up with Mullally last week at a meet-and-greet for her new stage production It’s Only a Play, she confirmed her guest spot and started teasing. “As a matter of fact, I just was in Los Angeles this week, and I just shot on Friday,” she told us. “You will literally not believe how it ends.” Why? Does something crazy happen? Mullally kept mum, but clearly, there’s a whopper to come: “When you see it, just remember me saying, ‘I can’t believe that I did that.’ Like, I never thought I could do that. And I did it.” Fair enough! We’re excited. (And also maybe a little concerned.)