Movie Dragon Gets The Point

In the movie Dungeons And Dragons, an evil mage has imprisoned a dragon in his dungeon fortress. The mage acquires a magic specter that is supposed to control the dragon. The portcullis to the dragon's cell is raised (as seen in the accompanying image) but the monster won't obey the mage.

The portcullis is dropped, spearing and crushing the unruly dragon. Since the dragon was swearing, that makes the portcullis a billingsgate.