Eric: How could you ask Laurie?
Kelso: Well, Jackie didn't want to go. What choice did I have?
Eric: Oh, man.
Kelso: See, now you see my problem. Since Laurie's going, I'm gonna have to make out with her. And if Donna goes, she's gonna see me making out with Laurie and then tell Jackie, therefore, Donna can't go.
Eric: Or... you could just not make out with my sister.
Kelso: Be serious, Eric.
Eric: OK, look. Donna's coming, and if that blows your weekend, then... too bad.
Kelso: Fine. But you know what? You're making cheating a lot harder than it has to be.