I love Father Ted and first encountered it when I was lying on the sofa suffering from morning, noon and night sickness and feeling sorry for myself one Christmas.
I'd lost the remote and couldn't be bothered to get up and change channel when it came on (I had somehow got the idea it was a twee, cutesy sort of thing). It was the lingerie department episode and I laughed myself silly.
I think my favourite was The Holy stone of Clanrichart when Father Dougal turned one of the visiting bishops into an atheist.
Or perhaps the boycott of the "fillum", or the one where they're about to die in a plane crash and a priest declares his undying love for the priest in the next seat...and then the embarrassed silence when they're miraculously saved...