Happy days was an all-time great American sit-com. It was set in the 50s and kind of cheesy but that is what I loved about it.
The Happy days theme tune was enough to get me watching, "Sunday, Monday, happy days, Tuesday, Wednesday, happy days..."
The Fonz was my favourite character. Slick is the word I'd use to describe him; as a kid, although he was far too old for me, I still fancied him!