Jimmy Fallon had the most surprising of surprise guests drop by Late Night last night: Conan O’Brien, his time slot predecessor. (Do you think it was difficult for O’Brien to gain admittance into NBC? Or did he just pretend to be Carson Daly and no one really knew who that was?) The appearance was a brief bit meant to promote a week of upcoming shows O’Brien is doing at the Beacon Theater in New York, but at least it gave him plenty of time to confuse Questlove and retrieve something he claims to have left in the studio: Triumph the Insult Comic Dog, a piece of NBC intellectual property that O’Brien was forbidden to bring over to TBS. Sadly, Triumph is just a deflated puppet husk at this point. His glory days of pooping on people and ideas are over.