Piper appeared in “The Gang Wrestles for the Troops” and “Mac and Dennis Buy a Timeshare”, playing a local Philadelphia wrestler who goes by “Da Maniac” and is always down on his luck. It appears he also took a lot of metal chairs to the dome, as he mumbles incoherently from time to time and seems to not understand most of it. (For example, when Mac (McElhenney) and Dennis (Howerton) try to get him into the timeshare, he thinks it means they're now roommates.) Apparently, Piper really got into character whenever she was on set, which Howerton described:
“Okay, so what I remember was when he came in, he was like, there was some method acting going on, he was in character. He would, I mean, he would interact with us, but he was – He kind of stayed in character to a certain extent. And I remember thinking at the time, and I think I brought this home to you, he was so good and played so real. And then his performance was so haunting that it was like I was watching him thinking he could have played The Wrestler, in Darron Aronofsky's 'The Wrestler'. He would have been incredible.”
The guys explained that Piper was such a character that it could be a little difficult to communicate with him on set. They pointed out, however, that he was a completely different person in the locker room, where he was out of character and just himself. It must be very intimidating trying to do a comedy with a guy acting like the Maniac around, but the results are spectacular because both episodes are extremely funny.