Millions of people around the world have become huge fans of the hit cartoon series, Family Guy. You more than likely already know it, but creator Seth MacFarlane actually performs the vast majority of the character voices on the show himself – including Peter Griffin, Stewie and Brian. When he recently stopped by the Graham Norton Show on the BBC to promote his second directorial effort on the big screen, A Million Ways to Die in the West, Seth MacFarlane was able to perform many of those Family Guy voices right there on the spot. What will shock you about these voices, though, is how Seth MacFarlane came up with each of them! When Seth MacFarlane explains that, your jaw might quickly hit the floor!