I was just thinkin' to my self, "was the early 1990's TV just the best." Between 1990 and 1994 (also including shows that started in the 1980's and went through the 90's) so much great TV was on the air.
The "timeless classics" are the ones where the jokes are still somewhat relevant in today's world. Call the storywriters "visionairies." They had an innate ability to create jokes/storylines that would be funny 10/20 years down the road. Many shows contain pop culture references that were funny back then, but when you watch it now, you're like "WTF?"