maybe it was hitting the inclined surface of the podium? I can see it staying upright after smacking into a wall, but then the tall lever-arm has something to push against.
on the one hand i am very interested, and want to know the same thing. even more so the "Arby's" quasi-sponsorship on the daily show, which is universally negative about the brand.
on the other hand, i like the mythical idea of them not being part of viacom, that stewart and colbert just do what they want. :-)