Flash mobs may be so 2011, but this one rocks.

Skule Nite 1t3, a engineering musical and sketch comedy revue troop based out of the University of Toronto Faculty of Applied Science and Engineering, decided to warn first year Engineering students at their school about what they were getting themselves into during their first exam.

While the exam's proctors at first seem to be confused and angry at the interruption, keep watching. It gets better.

They're in on it the entire time, and are therefore the coolest professors ever.