6x21 Theo's Dirty Laundry
First Aired: Mar. 15, 1990 on NBC
Summary: When Cliff discovers women's underwear in Theo's laundry, they soon find that he has moved in with his girlfriend, Justine. They aren't happy about this at all and tell Theo that he must move out immediately. Theo however refuses because he says he moved in to help Justine pay for the rent…
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Theodore 'Theo' Huxtable: I'm sorry.
Dr. Heathcliff 'Cliff' Huxtable: Yesterday, you said your mother and I were controlling you with our money and that you and Justine were gonna go on and live your own lives. Now, did you ever stop to think what would happen if we said you couldn't come back here?
Theodore 'Theo' Huxtable: No.
Clair Hanks Huxtable: Of course, you didn't! Because we're your 'safety net'! You go out, you mess up, you listen to our lecture, and then you go out and you mess up again! Well, Theo, I have had enough. I do not have the strength to keep letting you come back into this house.