Hoverboard
All 3 Back to the Future movies were about a technology that we can still only imagine, a time travel machine. But in the second part of the movie, they showed what they think the future will look like. There have been hoverboard prototypes and we can’t wait to try one in the future.
Actually, one of the X-prize challenges:
https://en.wikipedia.org/wiki/Tricorder_X_Prize
#9 thats not the only thing about that movie that already exists
stun gun