7x20 No More Mr. Nice Guy
First Aired: Feb. 28, 1991 on NBC
Summary: Disaster ensues after Denny misinterprets a surprise that his girlfriend, Ellen, is planning with Theo for him. This doesn't help Theo get ready for his romantic evening with Cheryl, even more so when everyone keeps interrupting him.
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Dr. Heathcliff 'Cliff' Huxtable: [on how everybody else has the perfect cure for Olivia's cold] This house is full of doctors.