This is to block the sun so we could use the projector. You can take a boy out of Alabama, but you can't take Alabama out of a boy.
"With my wife wanting to pick out curtains for our apartment and me getting tired of being woken up by the sun every morning I figured "curtains" consisting of trash bags and aluminum foil would help move her along to making a proper selection. Also doubles as a way to discourage guests as she doesn't want anyone seeing this hack job."
Not to mention it protects your against aliens reading your minds! Bonus!