You can't exactly change from a green screen to a real screen without him noticing. I'm pretty sure he'd notice the real screen, rather than a big wall of green.
Here’s one that could have maybe used a NSFW spoiler, but I couldn’t figure out the spoiler feature.
So a Space-X rocket first stage can fly into space then land unharmed on a tiny floating barge in the
ocean for reuse. But it can't travel on a public highway with out damage. lol