OK, I'm nerdy, but I have confessed elsewhere that my nerdiness does not necessarily lend itself to skill at many subjects near and dear to the hearts and minds of nerds. Namely, math.
Which means this classroom exercise, conducted by a teacher in Canada, both fascinates and terrifies me. The students donned headbands with a specific quadratic formula on them and had to figure out what their equation was using just yes or no questions they asked of other students. So they not only had to know about the equation on the headband of the student asking them, so they could answer and give the correct clue, but they also had to know about all of the others so they could differentiate -- in a non-mathematical sense -- among the equations to figure out which one they were wearing.
I figure this winds up as a sight gag on an episode of The Big Bang Theory sometime next season if it hasn't already.
(H/T Unequally Yoked)