First F was on SAS with my parents when I was just under 10. Sadly don't remember that much about the experience, except for it being quite a boring flight
Few more F flights on SAS and one with Lufthansa on a 744 where I discovered I quite liked caviar

Remember the F on Lufthansa being on the upper deck and it still seems they stick to that today.
Off to snatch a CW fare and throw in some Avios for an upgrade...