3. Matt Walsh (Joshua, Season 2-Aerodynamics of Gender)
This may be my favorite guest role of the entire shows run. This is mostly because I love Matt Walsh, but it was also the show going further than I can ever remember before. Walsh plays Joshua, the keeper of a secret garden, which includes a trampoline. Theres only two rules: No one can know, and no double bounces. After a series of ridiculous events leaves Pierce with broken legs and Joshua out of a job, we get the payoff for his character. Troy and Jeff come to apologize, with Joshua replying, Guess thats what I get for trusting some black guy. This leads to a hilarious flashback, as the two realize that Joshua has been racist all along, culminating in a swastika tattoo on his chest (Its going to be a maze).