[s3e10] Mac Is A Serial Killer Today

In the It's Always Sunny in Philadelphia episode " Mac Is a Serial Killer ," the gang falsely suspects Mac is a murderer due to his suspicious behavior,, which is actually a secret, embarrassing hobby [1.1]. While Dennis and Dee spy on him, and Charlie and Frank hunt for the killer with a chainsaw, they ignore the true threat: their neighbor, Gary, who is collecting heads [1.1]. The episode, which introduces the pimp Pepper Jack, ends with the gang unfazed by the real danger and just annoyed that their theories about Mac were wrong [1.1].