Jon Stewart just wanted to say goodbye to his viewers before he took off for the summer to direct a movie. But his replacement, correspondent John Oliver, just had to get involved. Oliver even ruined Stewart's "Moment of Zen," putting some pens in an unfortunate place.

Earlier in the show, Stewart took some time to explain the motivation for making his film, based on the book Then They Came for Me by Maziar Bahari. Oliver starts June 10.