Pontus Navigator so you need to have seen something in real life now to know if it is real or not? By that logic when I went to watch FC Barcelona play last year I never should have recognised Lionel Messi or Luis Suarez because I'd never seen them in the flesh before.
I've seen video footage of plenty of "real" explosions thanks, just as I've seen my share of CGI ones to compare them with. I happen to recognise the difference, especially when the light sources and shadows and propagation are all wrong.