A professor at Aquinas College in Grand Rapids, Michigan, has a policy that if a student's phone rings in class, they have to answer it on speakerphone - a pretty wily one, we think.
But this policy was just begging to be taken advantage of, and this professor was ripe for a pranking.
One student bravely put herself forward as the prankster, and what happened next leaves the macroeconomics professor feeling a little red-faced.
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