"Unplugged" from his omniscient teleprompter, that is. It seems that when he isn't being fed his talking points, he reveals his true colors despite himself. Hear what he considers to be a "punishment".
Granted, this happened during his campaign, but bear in mind:
1) Now that he's president, he has done more to punish the little "punishments" simply because they exist.
2) He's always in campaign mode anyway, so why should he mind this clip being shown?