You already know this, dmom, but two of my all-time favorites come from Roseanne. Jackie in the bathtub stoned. And "Becky cut the cheese!"
Finding out that Mr. Big's name was.....John. And when Miranda let down her guard when she gave Steve's mom the bath, and when Charlotte got her baby, and when Samantha got her groove back after her breast cancer treatment. So basically the entire last half hour of the Sex & the City series.
When Val is reunited with her twins on Knots Landing.
The pot smoking episode from Roseanne, same one Stink's talking about(and I wouldn't be surprised to see Onut, Frecky & All Aglow post the same thing )
The episode where DJ "gets caught playing his instrument in Band"
The series finale from Sex and the City
The episode of Sex and the City where Carrie is a "model" for a day and falls on her face
When Ricky finds out Lucy is pregnant and he sings "We're Having A Baby, My Baby & Me." The emotion between the two always gets me choked up because I heard/saw/read that they tried so hard in real life to have children.