I should have attempted to be clearer - I specifically only meant to question the "fun" part. I didn't mean to suggest it's not a "good" fact, or a good "random" fact. Sure, it'd be great in a discussion as you describe.
Trying to think of some analogy to illustrate my point - imagine watching a movie, and someone says: "fun fact, actor xyz is also in movie abc." I, personally, would think: where's the fun part of this fact?
Fun facts need some oomph! Some surprising bit to them, something you wouldn't have seen coming. "Actor xyz showed up unannounced at my cousin's wedding for reason abc", would be a "fun fact".
Or you're listening to a Björk album with a friend, and half-way through he says: "oh, actually, fun fact, I once played on stage with Björk during a festival in Iceland", and he proceeds to launch into a few anecdotes.
Here, the fact was: "someone who wrote a seminal paper in AI is working in an AI company". I, personally, said to myself: oh, right. What's the surprise?
Apparently that was seen by some as an uncouth and uncultured reaction (not you though, you were very polite, hence my responding here). Oops.
I get what you mean re the unexpectedness of a fact and level of fun, too. So thanks for explaining -- makes sense and I understand your original comment better :)
Isn't this basically what (we'd like to think) HN is?
Maybe if we could make it feel more like house parties it’d work.
It was an amusing remark though nonetheless, out of all of them it's the one that gave me a chuckle.
I responded to the general responses just above anyway, if you're interested.