This is one of my favorite episodes. It's Clair's birthday. She's 46 which is interesting because Cliff is already 50 and they're only supposed to be a year or two apart in age. Past episodes have implied this. Anyway, after enduring the teasing from both the kids and Cliff, Clair treats herself to some pampering at the spa/salon where she meets one of her girlfriends and they giggle about how women should both look and act their ages.
Back at the Huxtable residence, a sign is waiting for Clair which reads, "Happy 64th Birthday" which Cliff quickly apologizes before changing the magnetic numbers to read "Happy 94th Birthday" which gets a good laugh.
Theo, Vanessa and Rudy put on a skit titled, "When Mom was My Age" complete with music from the different eras, authentic costumes, hair, and makeup.
Placido Domingo guest stars in this episode and Clair is serenaded for her birthday by one of the world's greatest tenors. He sings bits from "Amor Amor Amor" a classic Spanish love song that's been covered by many artists (see iTunes) and "Beseme Mucho" by Andrea Bocelli. If you're a woman, you'll be swooning right along with Clair and her friend.
The show ends with one of the most entertaining non-dialogue scenes in the entire series. After Clair thanks Cliff for not buying one of those cakes with the white icing and strawberries, he proceeds to put on some music ("Look at This" by Grover Washington Jr) and returns from the kitchen carrying one of the said cakes. With much eye rolling and classic "Cosby Face" Cliff tries to get Clair to eat but she refuses. He takes the cake back to the kitchen only to return with TWO, then THREE more cakes. Clair finally breaks and, together, using nothing but a pasta serving spoon, they devour the cake with white frosting all over their faces and a kiss.