When I think of romantic, when I think of heartwarming, when I think of being sweet... I don't think of drones. But if I think of awesome and if I think of kickass and if I think of freaking cool... I do think of drones. So guy who used a flying drone to drop off the ring while you proposed, you're awesome.
Any sort of flying drone is already awesome. How do you make it more awesome? Attach a camera and arm it with a paintball gun so it can fly around and shoot unsuspecting people, animals and/or objects. Doesn't that sound like a crap ton of fun?