Cliff's parents are celebrating their 49th anniversary (a pretty impressive feat under any era, let alone now) where they have to think of something to do for such a milestone. Their idea: lip-singing to "You Know the Night Time (Is the Right Time)" by Ray Charles. Theo, Cliff and even Rudy join in the lip-sync fun (this being four years before the whole Milli Vanilli) mess. The result is television history, as this becomes one of the most memorable moments of an episode of any television series.
Finally, the Huxtable family decides to give Russell and Anna a painting depicting when they first met.