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Even funnier, the woman who played that character also played another character in a later season, in that episode with Sam's imaginary friend, and she had to hear Dean say "you know, the family that showers together..." while standing right next to his brother.

SAM: Or it's an invisible killer. DEAN: My favorite kind. What do you think, Scully? You wanna check it out? SAM: I'm not Scully, you're Scully. DEAN: No, I'm Mulder. You're a red-headed woman. S02Ep07 - "The Usual Suspects"

HENRIKSEN: Well, you're not the typical suspect, are you, Dean? I want you and Sam out here, unarmed. Or we come in. And yes, I know about Sam too. Bonnie to your Clyde. DEAN: Yeah, well, that part's true. S02Ep12 - "Nightshifter"

VERITAS: So, Sam walking back into your life must have been a relief. Hmm? Mallory to your Mickey. And how do you feel about the band getting back together? Hmm, Sam? SAM: Look... what we do... is hard. SAM: But...we watch out for each other. DEAN meets SAM's eyes, communicating a plan. SAM: And that's what's important. And that's it. That's the truth. S06Ep06 - "You Can't Handle the Truth"

HEDDY: I knew those boys were trailer trash the moment they rolled up in that American-made. BEVERLY: Not to mention homosexuals. HEDDY: Ugh. Homosexual murderers. Like Leopold and Loeb. BEVERLY: Only hotter. S10Ep06 - "Ask Jeeves"

Dean: We're the brothers that rock together. Hmm? We're kind of like the American Oasis. Manager: Ew. S12Ep07 - "Rock Never Dies"

SAM: Is this how you pictured it? The end? DEAN: Oh, you know it's not. I always thought we'd go out like... Butch and Sundance style. Sam chuckles. SAM: Yeah. Blaze of glory. DEAN: Blaze of glory. Dean smirks. DEAN: Son of a bitch. Dean closes his eyes and smiles. S12Ep22 - "Who We Are"

DEAN: Alright this is what we’re going to do, next year we’re doing Halloween right okay? I’m thinking matching outfits like uh, Batman and Robin. SAM: No. DEAN: Bert and Ernie. SAM: No. DEAN: That’s weird. SAM: Yes. DEAN: Uh, Rocky Bullwinkle. SAM: Dean… DEAN: Shaggy and Scooby! SAM: Why would we? DEAN: Turner and Hooch. Ren and Stimpy. SAM: Come on now. DEAN: Thelma and Louise. SAM: Thelma and…? DEAN: We just put it in drive and go. S14Ep04 - "Mint Condition"