I've never watched Jojo; I've watched a lot of anime, but even so there's a good number of popular/classic ones I've never seen, like Madoka Magica, Attack on Titan, Guilty Crown, Sailor Moon, etc., and Jojo is one of them. But when other anime make reference to it, and when some one makes reference to it probably expecting some sort of reaction from you and you can't respond in any way, it does does sort of make me wonder what it's all about....