You might recognise Hank Azaria from shows like 'Friends' where he actually showed his face, but some of his most famous roles are actually from everyone's favourite cartoon family - 'The Simpsons'.
So when Hank was invited to give a graduation speech at Tufts University, he decided to have characters like Chief Wiggum, Moe Szyslak and Comic Book Guy drop by with some advice for the students.
The voices start about halfway through his 18-minute speech, but the whole thing is worth listening to.