Most Incredible Thing

This past summer I was at my friends grandparents house that is on a lake. While out boating I heard a engine noise but it was not coming from the water. When I look into the air I saw two flying go-cart type vehicles going around the lake. They had this big fan contraption on the back of them that were keeping them in the air. I was so confused when I first saw these things and could only think of how that is possible. They were moving left, right, up, and down all from a fan. I couldn't stop watching them flying around until they finally left the lake. For the next few days I was just thinking about how much I wanted to be flying in one of those. I think it would be one of the best experiences I would of had in a while. That was the most incredible thing I have seen in recent years.