Looks like the president of Gearbox Randy Pitchford is giving away SHIFT codes for golden keys at various times this weekend.
These are currently good for 1 activation per account for the next 2 hours.
Win PC: C3WBT-6BZF9-FBJBJ-B3JJJ-BB53S
PS. if you don't know what shift is, click extras in your Borderlands 2 Main menu.