If movies are supposed to be above all else fun, then Back to the Future is everything a film could hope to achieve. In the mid-1980s, Steven Spielberg could get a studio to agree to anything and then do it his way. Back to the Future is proof. A teenager discovers his goofy friend of a scientist has actually created a time machine. When his friend is killed, young Marty jumps back in time to save him. Somehow, while accomplishing that task, he accidentally erases the event that caused Marty's parents to fall in love. Now, he's gradually ceasing to exist... unless he can get his parents together and, yup, get back to the future.