When my grandson was 3, he was watching a movie on his mom's laptop while she got ready for work. He got a funny look on his face and threw up all over it. When he told me about it he said, " Well, Granny, I was watching my movie and all of a sudden my tummy said 'Surprise!' Even now, when you tell him you brought him a surprise, he's not 100% sure it's a good thing.
When his dad was about the same age he explained to his grandmother that the lady on tv died because her breather went out...DUH!