Will Ferrell delivered the commencement address to the University of Southern California's graduating class of 2017 and it was hysterical. Comedians and Actors are often asked to give commencement speeches. Conan O'Brien spoke to the Dartmouth class of 2011. Stephen Colbert returned to his alma mater, Northwestern University, 25 years after graduating to give the commencement address. Charlie Day also spoke at his old school, Merrimack College, in 2014.