You double over in a coughing fit. You're coughing so much that tears come out of your eyes. Suddenly, something funny happens. You start rising up into the air until you stop coughing. You realise that when you cough, you will start floating, but when you stop, you drop back down.
This could be useful!you think, and immediately three thoughts pop into your head. Firstly, you could become a magician and use your hovering to be your act, secondly, you could use your talent to scare your friends, or thirdly, you could become a traveller and travel around the world using your skills of floating.