A key part of comedy, some believe, is saying what others are thinking. I’m not sure everyone who says that really understands why that’s a thing, but Harley Quinn, Max’s adult animated comedy about DC’s irreverent antihero, absolutely does. It is, among other things, a show dedicated to shouting what many people think about when they read Batman comic books. And what are they thinking about? Nightwing’s ass.

The notorious Booty of Blüdhaven is one of the series’ best new running gags in a show that has found a way to work in the Bat-family without becoming a Batman show. After a third season that was a little too focused on Batman, Harley Quinn season 4 puts Harley (Kaley Cuoco) and Poison Ivy (Lake Bell) back in the spotlight. In the new season, their relationship is still going strong, but their professional lives are at odds. Ivy is now the CEO of the Legion of Doom, Lex Luthor’s (Giancarlo Esposito) team of villains. Harley, meanwhile, has joined the Bat-family, trying her hand at hero work and helping Robin (Jacob Tremblay), Nightwing (Harvey Guillén), and Batgirl (Briana Cuoco) out while Batman is out of commission.