In the episode titled "Rumours", where they try to make the school jump in the air by flushing every toilet at the same time, near the end where Sweeny & Gordy are trying to escape, listen carefully. Almost straight after Gordy says "Come on man!" or something like that, you can hear Gordy whisper "Oh S***"! I couldn't belive it at first so I rewound it and it is definately there. Before you say "He's just saying shoot!", please watch the episode, it's easy to say that if you haven't heard it.