Earl goes to confront his mother who offers him cookies. He says what he'd like more than cookies is to know why she had sex with Mr. Clark. And there go the cookies. Come on, Earl, you have to tell her to set down the plate of cookies before springing something like this on her. There's no reason to ruin a perfectly good plate of snickerdoodles, after all. And poor Randy wanted the snickerdoodles more than the knowledge, so now his day's ruined. And since I am in love with the name Clark Clark I have to transcribe what comes next, verbatim:
Kay: Who told you about me and Clark Clark?
Earl: Clark Clark.
Kay: Clark Clark! Damn you, Clark Clark.
Turns out Clark Clark and Kay kept each other company when Carl was working and Mrs. Clark was in self-defense class. They just hung out playing cards until they had too many wine coolers, and had sex. She regrets it and breaks it off the next day. We then get to see the whole scenario again when the boys felt guilty and Milo confessed but from Kay's perspective. It's pretty much the same except for her fear at being discovered, and her guilt over breaking Clark Clark's heart heart.
Earl says she has to tell Dad. She refuses on the grounds of him not being an angel, either, what with the Hooters receipt she once found. Earl says that no one knows what it's like to be cheated on more than him, and "Dad deserves to know!" That line is, of course, Carl's cue to walk in and say, "Deserves to know what?" Milo starts, "Oh, Carl, wait until you hear this: Apparently, your wife..." and then Randy awesomely rips Milo's head off. There's little time for laughs, though, because Carl demands to know what the puppet was talking about. Earl turns to Kay, who says, "Carl, do you remember 1985?" Cut to Carl walking out the front door with a suitcase screaming, "My wife's a whore! All neighbors are welcome. Line forms at the garage."
Carl ends up in Earl's hotel with him. Carl is appropriately angry at all he's put up with. Earl sympathizes, "I hear you. You steal for them. Fight for them. They still hand you a different-colored baby from a different-colored father. Bitches." And then he adds that Clark Clark is lucky Carl doesn't kick his ass. But Carl says Clark Clark's luck just ran out and he's going to wish he went across the street and banged Mrs. Henderson. Earl's in for the fight, but he has to throw in that he, in fact, did bang Mrs. Henderson.