Hi, i don't post much in this forums. Just wanted to say that jousting in films has nothing to do with reality.
The aim was to break your lance, not to dehorse the knight. If you fall from a horse in plate armour you would propably break all your bones.
Also hits to the helmet were forbidden usually. If the lance breaks it you can get killed from splinters. That happend from time to time.
Maybe there were exceptions, but most of the time the participants wanted to survive the tournaments.