Quote from Fez in Laurie and the Professor
Kelso: Okay, these are Laurie's, right? Hyde: Kelso, what exactly are you gonna do with those panties? Kelso: Just look at 'em. Fez: Kelso, did you ever notice that Laurie and Eric have the same eyes? So, if you're doing it with Laurie, and she's perhaps wearing a hat, it's kind of like you're doing it with Eric, too. [laughs] [When Eric, Kelso and Hyde don't laugh, Fez walks out]