Dispite many a movie plot or TV episode built around this idea, only the money on the table is in play.
One player cannot force another to wager more money than he has in front of him. Nor can a player bet more than he has in front of him. He cannot reach into his pocket and pull out a $100 and buy more chips mid-hand.
Of course if all parties agree to bend the rule, then they can bend the rule.
Enjoy that lawsuit or broken legs, depending on where you are calling this bet.
yeah - world of legal hurt heading your way.