April 1st usually brings out silly and, let's face it, sometimes downright annoying pranks. But what happens when a brand uses WhoSay's star studded line-up to "prank" students all around the country in a good way? Check out how Chevy turned what could have been a regular day into the #BestDayEver by having celebrities step in as guest speakers in unsuspecting classrooms around the country. Nikki Reed and fiance Ian Somerhalder crashed an Emory marketing class in Atlanta last