The six horrible Herdman children create mayhem during Halloween. Annotation. The Herdmans plus Halloween have always spelled disaster. Every year these six kids -- the worst in the history of Woodrow Wilson School, and possibly even the world -- wreak havoc on the whole town. Now the mayor has had it. He's decided to cancel Halloween. And what's Halloween without candy? And without trick-or-treating? The Herdmans manage to turn the worst Halloween...