Public failure as a motivation
freakonomics.blogs.nytimes.com
freakonomics.blogs.nytimes.com
Past students of mine have repeatedly told me to be a bit of a bastard in the classroom, as they find the persistent threat of embarrassment (if they are unprepared) to be a useful motivator.
That's a recipe for disaster. People's learning styles vary greatly, and helpful motivation to one student might be traumatic humiliation to another. Since students are a captive audience, the people who hate that style will just stop coming to class.
People will embarrass themselves enough as it is; no need to do it for them.