I Remember the Coatroom, I Just Don't Remember You (S01E19)

Judith's sinister-but-sexy sister, Liz (Teri Hatcher), plans to attend Jake's 11th birthday party. Alan asks Charlie--who had sex with Liz in the coatroom at Judith and Alan's wedding - to behave. But when Liz arrives, she ignores Charlie and flirts with Alan instead. Liz proceeds to cause a commotion between her sister, whom she's never really gotten along with, and her ex-brother-in-law. Meanwhile, Evelyn forgets that it's cake, not alcohol, that's traditionally served at a child's birthday party, and she proceeds to party her own way. (Warner Bros. UK)