Jack is the first boy to denounce the power of the conch and it takes place very early in the novel. After the boys' first attempt to make a signal fire on top of the mountain, Piggy takes the conch and attempts to explain the importance of creating smoke instead of flames. However, Jack interrupts and begins ridiculing the majority of the boys for not helping. When Piggy chastises Jack for speaking without the conch, Jack denounces the conch's power by saying,
The conch doesn't count on top of the mountain...so you shut up." (Golding, 32)
Jack's comment about the conch not counting on the top of the mountain is significant and foreshadows his disregard for civilization.
Jack once again denounces the power of the conch towards the end of chapter 5. After Ralph gives a speech concerning the fact that none of the boys are completing the agreed upon tasks, Jack interrupts Piggy, who is holding the conch and speaking. When Ralph reminds Jack that he is breaking the rules and not respecting the person holding the conch, Jack denounces the power of the conch once again by saying,
Bollocks to the rules! We're strong--we hunt! If there's a beast, we'll hunt it down! We'll close in and beat and beat and beat--!" (Golding, 70)
Jack then leaves the assembly and the hunters follow him.