update: I tried with all my songs and yes I know it doesn't work with every song. I just think it works if you play the song on time or it works with some sort of upbeat song. But yea, it doesn't work perfectly like you would expect.
If you use the dark side to help you get through grading papers you may be the sith lord otherwise known as Darth Grader. Show off your nerdy educator status in this funny nerd design. Perfect for nerdy teachers all over the galaxy.
Watch me Click! Now Watch Me Grade Grade! Bust out your red pin and get ready to grade some test! This funny teacher's shirt features an illustration of a hand holding a pen and the phrase "Watch Me Click, Now Watch Me Grade Grade.