One of the most looked at items in a classroom is the wall clock. Students often gander at the clock to see how much time is left in a certain class. This teacher decided to post a small message on the clock that can be either a challenge or a threat to those impatient students.
It is common to have students make funny faces or expressions in the class yearbook. But for this instance, we actually have the professor making a weird expression, and with props. Some could even see this as this teacher’s subtle way of “flipping the bird”.