10 Worst Movie Decisions With Unbelievable Consequences

10. Gambling With The Future - Back To The Future Part II

Someone always just has to try being the wise guy, don't they?

When Marty McFly makes the decision to buy a sports almanac and bet on races he knows the outcome of, he most certainly didn’t expect that it would end up making his mum marry the absolute beast that is Biff, and that it would make Biff the Donald Trump of the alternate future.

After getting hold of the almanac, Marty and Doc carelessly allow it to fall into Biff’s hands. Whilst they’re away dealing with their messes, Biff borrows the DeLorean and travels back in time, giving his younger self the almanac so that he can get rich off betting.

Because of this, when Marty and Doc return to 1985 they find that Biff has become incredibly rich and is now Marty’s stepdad!

Had Marty heeded Doc’s advice and made the sensible decision to return the almanac and not mess with time-travel, none of that would’ve happened.