I might have posted upthread but I remembered something hilarious about DS at 4 years old (he is 6 now) - he does not listen to pop music, we let him listen to classical music at home and we have no TV time. So, his exposure to contemporary culture is nil (and he has boring parents too to add to it!). My 23 year old niece was blasting out a song that said "Watch Out Bad Romance" in her car at Thanksgiving that year - and DS went up to her and said: "Yes, those Romans were very bad people. They killed a lot of Gauls in the BC years. And that made me very sad." Only a few people there got what he was saying. And those that got it still recount it every time we meet.