"It seems like just yesterday I was holding my baby in my arms. And today my baby had two babies. Now she's a mother..."
One-shot character Ray Palamino, played by Sammy Davis Jr., introducing himself to his pregnant granddaughter who he hadn't seen in over 20 years.
"Hey everybody! My name is Ray Palamino. I'm 67 years old... and I can't read." As much as the character claims that it doesn't bother him, the strain in Sammy Davis Jr's voice completely contradicts it.
Also Clair's speech to Theo why she's so proud of him graduating from college in the final episode.
Going back to season 2, there's the letter that Cliff and Clair read to Denise after she announces her college decision.
A positive example: Cliff's friend Jake and Jake's friend Stanley finally resolving a feud they'd had between each other for a decade after learning their children were getting married to each other and were prepared to have the wedding without their fathers present if it became necessary.
A Meta example: The final episode aired during the 1992 Los Angeles race riots. Cosby went on air earlier that day begging people in the city to stop what they were doing.
Another Meta example: The sudden cancellation of reruns of the show on major TV networks after allegations of sexual assault by Mr. Cosby had come forth and only allegations. As of this writing, he hasn't even been charged yet but the damage to his career and the legacy of the show has been done.
Cliff moping over the old couch and chair that is to be replaced. It's played for laughs and seems a little ridiculous, but it can really strike a chord with anyone who's ever had a sentimental attachment to a piece of furniture.