This prank absolutely brought tears to my eyes. The reactions are, as you would expect, substantial and priceless. If you don't at least get a chuckle out of this then either, 1- you've seen it before or 2- you have a broken "ha-ha" and should get it checked!
An idea + a cell phone + the ability to keep a straight face = April Fools! I am not much of one for pranks, but I will give credit when one is pulled off to perfection. This is an April Fools Day trick that was well done and will be one that this college class and teacher will remember forever!!!