From S2, Ep1: “Charlie Gets Crippled”
Wayne: [in a wheelchair] Hey guys!
Mac: [pretending to be handicapped with Dennis] Shit, what do we do?
Dennis: Uh, okay. Just play it cool, man.
Mac: [blurting out] I have polio.
Wayne: Oh. Uh, okay.
It's Always Sunny In Trump's America
Sunny Dialogue with Scenes from the Darkest Timeline