there's some barriers in my office of work where you go through to get in and out and when you swipe the little glass doors move away from you regardless of which way you are going. so they can go two ways.
so now i want to make it a game that two people stand on either side of the door, someone shouts "draw!" or "go!" or whatever and passes are unsheathed from lanyards and both people try to swipe and whoever the door comes towards is the loser