I was about 10 years old when this episode first aired, and it's always stuck with me.
Grandpa sneezes into the napkin at the dinner table, and heads to him room, the credits role over the opened napkin sitting on the table. Grandpa's nose stares up at you from inside the napkin. Pretty good stuff for 1980s television.
I couldn't tell you much more about it, as that's the one scene that is completely ingrained in my memory banks.
It's a shame that this series hasn't started coming out on dvd yett, but I'm glad that when it does, this episode is in the first season.