Probably this has been discussed here before but Jack in the FST seems to remember unconsciously that the "reality" he is experiencing is not real and is time to wake up. We see two times a sudden injury in Jack's neck caused by his concious trying to make him realize of what happened in his fight with Locke and that he is dead. What I have not realized until now is that the scar he thought it was caused by appendicitis was in fact another game of his subconscious to remember him one time he had a one inch knife inside his stomach.
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