I was talking with Marcus about an old postcard from New York, and somehow we got onto the World Trade Centre being "knocked down by a plane". Actually it was my fault for saying they "used to be" the biggest towers in the world. Why did they get knocked down by a plane? "It was a big mistake" I lied.
Then a day later - were there people in the buildings? Were they at the top or the bottom? I told him lots of people were in there. They are dead now, they're gone for good. [We are trying to teach him not to lightly bandy around the words "kill" and "die" by teaching him that it is permanent and very serious].
"That's a little bit sad" he said. Probably empathising with the building - he hates it when the towers he builds get knocked down.