His ‘Getting to know your district’ series, where he interviews the elected members of various districts in the House of Representatives, is pretty funny. Here Colbert talks to a Democratic member from Pennsylvania.
I am pretty certain that the congressional staffers prepare the member to expect Colbert to go weird on them but they still seem to be taken aback and put off-guard by his interviewing antics. I honestly do not know how you can prepare for him because he goes off on such strange tangents. While I am sure that Colbert prepares carefully for them, I also suspect that he is a master of improvisational comedy, where you go with the flow.
(This clip appeared on April 25, 2013. To get suggestions on how to view clips of The Daily Show and The Colbert Report outside the US, please see this earlier post.)