Grand Rapids, Mich. -

This Aquinas College professor has one rule: if your mobile phone rings during class then you must answer the call on speaker phone. But in this epic April Fools prank, his class may have taught him a lesson.

In the viral video that has more than 3 million hits, students at the Grand Rapids college play a well-drawn out April Fools prank on their professor. Lets just say, he might consider changing his cell phone policy.

Watch the video below, or right here.