What's Mark Z? Well, it's basically a code for "transforming car seat."
And you've seen impersonations of Robert Downey Jr. before, especially in fan films - but impersonating his face digitally strikes me as a whole 'nother level. I think filmmaker Anthony McGrath completely "gets" the movie version of the character...and if this is his calling card, I'd be taking a second look if I were Marvel Studios.
I struggle enough with my own car seat, which has that automatic moving seatbelt device every time you open and close the door. I already feel like it hates me - would hate to do battle with a foe wearing it as an armor. But could I trust it as my own armor? Perhaps I am overthinking.