Starting in 2008, a University of Maryland psychology lecturer Dylan Selterman started giving a ridiculously difficult extra credit question on the final exam, and since he started, only one class has gotten it right.

So, what is this ridiculously difficult extra credit question? This:

Select whether you want 2 points or 6 points added onto your final paper grade.

That seems easy, but there’s a catch:

If more than 10% of the class selects 6 points, then no one gets any points. Your responses will be anonymous to the rest of the class, only I will see the responses.

In layman’s terms, Selterman told BuzzFeed that the extra credit is a way to show how outcomes depend on other people’s actions and what happens when a person is selfish over thinking what’s best for the group. It’s basically a genius way to end a psychology course.

In the end, the viral debate didn’t matter for this class since they still didn’t receive the extra credit. We’re not for sure if future students will learn from this, but hopefully the question still continues to screw with students’ heads for years to come.

Via Buzzfeed