I was a bit spooked by this exchange with my DS when he was aged 2.5. I had put on the radio and there was some rap music on it.
DS "That's Dr Dre!"
Me "Err....yes...it is. How do you know Dr Dre?"
DS "I've seen him once. In London"
We rarely play any rap music in the house and live nowhere near London. Absolutely no idea how he would have come out with that chat! I was a bit spooked and really interested in his previous life in London, but sadly he hasn't followed it up with any other details.