Films zijn leuk amusement tot dat ze hun eigen logica over scheiden. Daar om heeft de website Cracked.com nu deze lijst gemaakt waar zes helden door gaten in het verhaal worden gered. Denk hier bij aan District 9, Star Wars en......Back to the Future.

#5. Back to the Future Part II -- Doc and Marty Can't Go Back to the Future ... But Biff Can

What the Movie Tells Us:

Once you're in an alternate timeline, you can't go back to the original one.

In Back to the Future Part II, Doc Brown takes Marty and his girlfriend to the year 2015 to save their retarded son from going to jail (instead of just telling them, "Don't raise your kid into a moron," since, you know, it hasn't happened yet). While they're doing that, dickwad Biff Tannen, now an 80-year-old man, steals the time machine and goes back to 1955 to give his younger dickwad self a sports almanac that will allow him to become rich by betting on sporting events.

Old Biff then goes to the future and leaves the time machine where he found it. Marty and Doc then head back to their present of 1985 ... only to find themselves in a 1985 where Biff is a millionaire and has reshaped Hill Valley in his ugly image.

Doc explains that they're now in an alternate reality created when future Biff changed the past: In this timeline, Doc Brown is crazy, Marty's dad is dead and his mom is a tramp. When Marty says they should go back to the future and stop old Biff from stealing the time machine in the first place, Doc says that's impossible, because traveling from this 1985 would lead to an alternate 2015 where Biff is even richer and Marty's mom is even trashier, presumably.

The only way to stop Biff is by going back before the timelines split -- that is, to Back to the Future I, because that was a way better movie anyway.

The Convenient Lapse in Logic:

So, according to Doc, once you're in another timeline, you can't go back to the original one ... except that's exactly what the future Biff did. The minute he changed the past, he created the alternate reality, so when he traveled back to 2015, he should have ended up in the alternate future Doc just mentioned. In fact, if he didn't get to enjoy the future where he's rich, what was the point of changing the past?

Instead, for some reason he ends up in the unchanged future ... the one Doc and Marty should have been left stranded in without a time machine.

This isn't the only time Back to the Future II breaks its own logic: It's been established by now that the only way the DeLorean can travel in time is by reaching 88 miles per hour -- but at the end of the movie, when lightning strikes Doc and throws him back in time, the car was just floating there, going at no miles per hour.