From this article:
Over the coming weeks, colleges and universities across these fruited plains will be holding their commencement exercises. Guest speakers will take to the podium to extol the virtues of higher learning, at least that is what most people hope.
The reality is that some commencement speakers will be controversial, if not outright embarrassing to the school. Yet, if everything holds true to form most will say what they have to say, pocket their fee, and their words soon forgotten.
Some of the more controversial speakers scheduled for this year’s commencements include:
...Though not likely to be thought of as controversial by some, Al Gore’s extreme position on global warming does engender controversy.