[quote=Jster]
Wasn't this the plot of Looper or something?I don't know, never saw it.
[/quote]

yes.... except when he killed himself to stop himself, he died and his other him completely disappeared but things continued as they were instead of creating a paradox. 

What they basically did was said "This sentence is false." and after saying that it was false once they ignored the fact that, that means that it's now true and just left it and "It's false, fucking deal with it."