No one could cross over from one to the other. There is an awful finality to hell. There is no possibility of working one's way from hell to heaven. This life is the time that you and I have to decide where we will spend eternity. Life is not a silly game.
Life is for keeps.
That's where all my buddies will be. We'll have a party. In hell there will be no partying. There will be no fun and games. There will be eternal darkness, eternal separation from God and from others.