"punchthebaby" LMAO... Now thats a funny nic.....

Anyway to the point. Here is an interesting site on time travel theorum.
http://merlin.alfred.edu/degraff/TimeTravel/

My favorite crux in this issue is the "grandfather" paradox. Ie... If I travel back in time and kill my grandfather. Do I still exist in current time or do I return as an unknown in current time as I was not born due to my grandfather not producing an heir being my father. Or do only exist at that point in the time that I commited the murder? Now my brain hurts too.........!