I've truncated this on purpose, because you've actually thought to ask a question no-one else has so far. I did brush on it earlier, when I said that the term was subjective. So subjective, in fact, that my ex-girlfriend thought her Clio was "fun" because it was a cutesy little French hatchback. From her point of view, because she enjoyed driving it, she was right but from mine, because it was an awful little box of horsevomit, she was unbelievably wrong. Oddly, when reading that thread, she agreed with everything I wrote, but said "But I like it!". Go figure.
Who was wrong when she thought her Clio was "fun"? In any case, if she were to (and she does still have an active account here) post "I'd have another Clio - they're fun", I wouldn't expect to see a 70-post, 3-day discussion about how wrong she was and how she needed to adapt (from people who hadn't actually driven one - and I'm not including you at this point)...
This aside, I - and others (which is, you know, more people so, according to the M5Power More People Is More Right method of judging things, is better) - have made a similar case before. And it's interesting that many of the I'd-rather-not-thanks in that thread are Europeans and Brits who've grown up as diesel has grown up rather than the stereotypical American diesel-hater.
Incidentally, I've been tasking some industry-geek friends and acquaintances with thinking up a single further example of the question I thought up earlier - how many car model lines have a diesel as the flagship variant (excluding diesel-only models). We're still only at the Skoda Fabia. Someone came up with the Peugeot 407 - the coupe version had a 201hp diesel 2.7 twin turbo alongside a 208hp petrol 3.0 V6 non-turbo until the V6 was replaced by a still more powerful version, and the saloon version recently had all petrol-engined variants cancelled in the UK - so we're counting that as a half. I recall that there's nearly a thousand car models available in the UK.
		 
		
	 
All that, and 
YOU STILL HAVEN'T defined your idea of fun, other than stating its highly subjective. I get that. But seeing as you've "pooh poo- ed" my definition (sporty) i'd like you to elaborate on exactly what constitutes fun, FOR YOU. Not your girlfriend.
Some get their kicks going fast in a straight line.
Some from having flashy, chromy, bright things. And having similarly minded people admire the flashy chromy bright things.
Some from having a loud stereo.
Some from going around corners, real fast.
Some from going around corners sideways.
Some from killing cones in a parking lot.
Some from making the car "dance" with their hydros.
Some from racing at the desert.
Some from rock crawling.
Oddly enough, some from towing heavy things.
Thats enough examples, but you get the idea. You're a bright enough lad. Give us something. ANYTHING. It doesn't have to be defined in one sentence, but anything so that we, the "unenlightened masses/ thundering herd of ignorance" can finally be illumined to this fun that you are so hell bent on keeping secret.
Thank you.