Borderlands 2 Wiki:Game FAQ
Q. How do I open the golden chest in Sanctuary? A. Golden keys gotten from shift codes occasionally released by Gearbox that can be redeemed through the extras menu.
Q. My car is stuck and I can't get it free! A. Melee the car to make it 'hop' or move
Q. People keep joining my game and I want them to stop! A. Go to the main menu then go to "server options" and set it to invite or friends only.