5. 'Back to the Future' fans, because Neil deGrasse Tyson said we'll never have hoverboards.

The scene that doomed an entire generation to crushing disappointment. (via YouTube)

If you haven't looked at the Internet in the last 5 years, you might not know that 2015 is the year of "the future" in Back to the Future Part II. Everyone has become obsessed with comparing the meager technologies of reality with the ones predicted in the movie (self-lacing shoes, robot waiters, flying cars). But no example has been more scrutinized than Marty McFly's iconic hoverboard.

If you're one of the many people disappointed that you don't have your own flying skateboard, guess what: that feeling will never go away. America's favorite scientist/killjoy Neil deGrasse Tyson delivered the bad news to The Huffington Post: