20 Times Celebrities Absolutely Nailed It With Graduation Speeches

Stephen Colbert delivered the commencement speech at Northwestern University, his alma mater, in 2011.

Can't-Miss Quote: "Whatever your dream is right now, if you don't achieve it, you haven't failed, and you're not some loser. But just as importantly — and this is the part I may not get right and you may not listen to — if you do get your dream, you are not a winner. . . . Life is an improvisation. You have no idea what's going to happen next and you are mostly just making things up as you go along. And like improv, you cannot win your life."