Movies that are more implausible than In Time

A few days ago I tried to explain my fascination with In Time, and its plot that defies all human reasoning. Reminder: society *chooses* to have timers implanted to count down their remaining days, only living past the age of 25 if they can afford to top up. Riiiight. But sci-fi being the genre it is, there's always someone out there with an even more crazy idea. So we put our heads together, drained our exhaustive knowledge, and came up with a list of sci-fi movies even less plausible than In Time.