If you’ve seen the movie “Back to the Future Part II,” you’re probably jealous of its future of flying cars, hoverboards, auto-fit clothes and holographic cinema. The date Marty McFly arrives at is October 21, 2015. Here it is and, of course, none of that has come true. (Well, save a hologram Tupac.) We can dream, though. In fact, here are five wacky gizmos that we’d love to have invade our lives.