That means you die.
If you die before you were able to go back in time and kill yourself, you never get the chance to go back in time and kill yourself, and as such, you are alive.
Would that mean that nothing you did would hurt your younger self?
[Edited on 04.24.2012 8:55 PM PDT]
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[quote][b]Posted by:[/b] AaronG67 But, when you think about it, that would mean that the traveller would have already tried to kill the grandfather, and failed. So he'll fail this time, too.[/quote]Except replace "The grandfather" with "his younger self." Almost the same thread three times in three days? *Sigh*