First off, I would strongly reccomend the film to those who have not seen it.
It got me thinking about time travel. Time travel to the recent past, a day or maybe a couple of hours. Would it be possible? The paradoxes it creates and the general 'fucking up of everything' that comes with even simple alterations to the past is very interesting.
![](http://upload.wikimedia.org/wikipedia/commons/8/84/Time_Travel_Method-2.svg)