I could have totally used the last one when I was a teenager. Would have saved me from all the struggle of taking the door off the wall to play beer pong and then putting it away before the parents found out.
Bunks in the closet, leaves the rest of the room as a play area. ...I can just picture some kid going into school and saying, "My mom makes me sleep in the closet every night." lol maybe, for this, remove the doors and add a curtain for easy in and out (: