If you're a treasure hunter your best friend will always betray you and become your rival and you will unwittingly lead him to the treasure you both seek at which point you will be held at gunpoint because you are the only one who knows the secret and/or has the key but will be saved by a third party of supernatural origins like zombies/ancient guardians or something and the cave will start collapsing but you will make a daring escape and ride off into the sunset with the girl.