I'll never forget my fellow freshmen student, Tony, in our Intro To Physics class who spent 30 minutes of class time having a heated argument with the teacher that the desk he sits at does not "push up" with an equal and opposing force against objects that sit still on it.
University teachers should get three cards that represent an "automatic fail go see financial aid for a refund and never set foot on this campus again" declaration, no questions asked, per semester.
In the end, that student would still be in your class arguing with the teacher...because human nature dictates those cards would be used for sex. Always.
I'll never forget the girl in one of my college classes who took every opportunity she could to rail against evolution and how she didn't come from a monkey. The worst part was that the class was an economics class!