Sarah: Would he tell me that this door leads to the castle?
Guard: [Whispers with his counterparts] Yes?
Sarah: So... the other door leads to the castle and this one leads to certain death.
Guard: [All the guards Oooh] But he could be telling the truth!
Sarah: But then you wouldn't be. So if he told me that this door leads to the castle, the answer you should give me would be 'No'
Guard: But I could be telling the truth!
Sarah: But then he would be lying. So then if he said this door led to the castle, I'd know the answer would still be 'No'
Guard: Is-is that right?
Guard: [snickers] I don't know! I've never understood it!
Sarah: No, no, I figured it out!
[Pushes the other door open revealing the castle's interior]
Sarah: I could never do it before! This is a piece of cake!
[Steps through the door and falls into a trap]
Sarah: AHH!