Jackie would of course have to referee a Quidditch match at some point, and would be attacked in the process. We would then be treated to some of the finest wire-fu in the history of the world as Jackie found himself forced to leap from broom to broom, dive through the scoring hoops, and spend about forty-five seconds whizzing around the field by holding onto a Bludger with both hands while fighting someone with nothing but his feet.
Let's not even start on what would happen if he were at the Triwizard Tournament. "The Chinese Fireball's escaped!" "Agh! Get Weasley!" "No, no, the dragon's all right, I mean that lunatic Jackie!"