13. 'Safety Not Guaranteed' (2012)
Mark Duplass plays the grocery clerk who's invented a time machine and places a classified ad looking for somebody to travel back in time with him; Aubrey Plaza plays the magazine intern who shows up on an assignment to investigate that ad. Guess who forges an unlikely connection? This indie movie explores the enduring fantasy of time travel: you get to live your life again, only better. What gives the film life — aside from great performances by Duplass and Plaza — is that it's not clear until the end whether they're indulging that fantasy, or whether his time machine actually works.