I am sure you have done this a million times with her, but I used to ask our daughter "is that real?"
If I was reading her a book about ghosts, I would ask "Is this real?" She would answer, "No it is just a story".
Watching Tv," Is this real?" She would huff and say, "Mom, it is just TV!"...
One morning the TV was turned to one of the morning shows and they were talking about something that made me mad and I said something to the Tv like, I know you did not just say that, Good grief.. Daughter looked up from her bowl of cereal and said.. "Mom, they cannot hear you, that is just the TV"... She was 3..