2 contributions from my 3 year old DS:
I was chatting to him, and said, " what do you want to do, Bryn?"
He turned around, and said,"I'm not Bryn, I'm Lyndon" (we don't know anyone with this name, and I'm not sure it crops up much on TV/DVD's etc!).He has called himself this before, but I didn't pay much heed. This time, I asked, "what do you like doing?", DS replied, "I built houses, and went fishing". DD then ran into the room, and DS began playing with her.
Next occasion was when we were at the village pond , feeding the ducks. DS picked up a long stick, and began 'fishing' with it.
Me: "that looks fun!"
DS "yes, I used to do this before, when I was big"
Bit disconcerting, really!