6. 'Looper' (2012)
"I'm a sucker for the time-travel genre," director Rian Johnson told Rolling Stone. "If you're a nerd like I am, it's really fun to work out the map of how everything is going to work." But he made sure this movie, about contract killers snuffing people sent back in time 30 years, didn't feel like "algebra homework"; instead, Looper has an aging hitman (Bruce Willis) confronting his younger self (Joseph Gordon-Levitt). For all its sci-fi inventiveness and thrills, the best scene is the two leads meeting at a diner: a young man looking his older self in the eye, determined not to turn into him.