Looper is a time travel movie of the “self-healing timeline” mechanic (a-la Back To The Future, although Looper “fixes” itself faster and changes to the time stream can be observed and remembered by everybody affected by them). As a result of this, and a few other issues, it suffers from a handful of plotholes and internal inconsistencies: however, it’s still an enormously fun film that I’d recommend that you see.
Looper is the second-best of all three movies that feature Bruce Willis travelling back in time and encountering a younger version of himself – and now it’s going to bug you until you work out what the other two are.
“Twelve Monkeys”, which I’m guessing is your favourite… and….. does “Pulp Fiction” count because the scenes are shown out of order? Oh, alright. It’s “The Kid”. Kind of.