Conan O'Brien seems to be slowly returning to his "Late Night with Conan O'Brien" roots. Last night, he "interviewed" Donald Trump on "Conan," using a comedy bit he had not performed since his 12:30 days on NBC.Trump was a frequent target of the recurring sketch, where a celebrity's face is superimposed with the lips of a "Conan" actor (usually writers Robert Smigel or Brian Stack), literally putting words in the mouth of the interviewee.