100:00:01,135 --> 00:00:02,935<i>- Get ready for the craziest</i>200:00:03,004 --> 00:00:06,005<i>hidden camera showin Nickelodeon history.</i>300:00:08,209 --> 00:00:10,075<i>This is "The Substitute."</i>400:00:10,144 --> 00:00:13,979<i>Every episode, your favoritecelebrities go undercover</i>5