This movie was mostly placed on a yacht type boat. And the only thing I really remember is that there was a tattoo(maybe a snake tattoo in the shape of an “8”) and marble in their mouth made someone a killer. They tried to kill the people on the boat and if they couldn’t they would transfer the marble in the other person’s mouth and a new person would now have the tattoo on them and try to kill everyone. It ended with a girl pouring gasoline on a guy and lighting him on fire. That’s all I remember if this rings any bells let me know!
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