Hagrid has never been the most athletic person, so when his class has to learn how to fly he is in big trouble.
“Now say up sharply and the broomstick should rise into your hand.” Instructed the teacher. I raised my shaking hand above the knobbly shape broomstick and said up. I hoped with all my might that the broomstick would stay firmly on the ground.  To my horror the broomstick however shot straight into my palm.” 
 Anything could happen when a half-giant takes off on a roller coaster ride…..