As others say, series like father ted with the Chinese, or the lingerie section, or thff egg plane, so many. Same with IT crowd, gay the musical, the religious folk being shown round, countdown and so on, a generation before and you have only fools and all the classics, and many more great series.
I find we do a lot of good stuff that is short lived, same with Frankie Boyle on bbc, he has the Richard Hammond and Rebecca adlington jokes, a few others and then it was watered down.