Choosing a speaker for an event can be fraught with peril. If you make the right choice, everyone goes home after a few chuckles or with great notes from an informative speech. Make the wrong choice, and you'll be wishing for Harry Potter's cloak of invisibility as the event descends into icy silence.
Last Laugh: Powerpointless Presentations
Lecturers Who Think They're Letterman Could Lead to Paper Airplane Attacks from the Audience. And Don't Even Get Me Started on the Visual Aids.