Who What When

I wake in a large white room with nothing in it, except for a fake plant by the door. As I start to gain my memory back a man dressed entirely in black, black suit, black shirt, black tie and even a black beanie covering his face including his eyes but no shoes. He places a small, green item on the floor then leaves walking backwards. As he leaves I get up and pick up the green item it is a little screen. It suddenly starts to play.