Why do you think a siren goes off in George's head at this moment in "Harrison Bergeron?"
George has above average intelligence and it's pretty clear that he's thoughtful and curious about things. This is why his mind is handicapped. Every time he even begins to question things, let alone think outside of the box, he receives a sharp sound from a transmitter to his ear that scatters and ends those thoughts. As he and Hazel are watching handicapped ballerinas on television, Hazel suggests that he might drop some of the weight from his handicapping bags of bird-shot, at least when he gets home from work. George responds that he could be caught, sent to prison for two years, and fined two thousand dollars or more. Then George adds:
"There you are," said George. "The minute people start cheating on laws, what do you think happens to society?"
Before Hazel can respond with her submissive answer that cheating on laws would ruin society, George is sent a loud siren to prevent him from thinking any further on the idea of cheating or questioning the system of handicapping people.