This always stands out as being a controversal moment, born from Eric Bischoff fustration at the growing success of WWE after the montreal screwjob and mankinds title victory given away by Tony Shivonne. Bischoff challenged Vince to a match at Slamboree and allthough it was obvious Vince would never accept Bischoff did succeed in turning McMahon into a joke.
bit obvious I know but there you go. Montreal Screwjob. needs no explanation.