I'm always fascinated by time travel stories because essentially you get to make the rules up as you go. But that's the catch—you have to have rules that your story lives by.
That's where I always get tripped up when time travel is a factor in something I write. I spend too much time on the rules and not enough time on the story itself. It's a problem that I have, but it's not a real, life threatening problem and most of those stories won't ever see the light of day anyway, so...
Enjoy the video.
By the way... I saw LOOPER last night and haven't been able to stop thinking about it. I might have to resurrect the Half-Assed Reviews in its honor. Holy Shit.
How Time Travel Works from Flavorwire on Vimeo.