Could have a future then. The last time I heard a sonic boom (Rafale jet at around 30,000 ft, rushing from one end of France to the other to intercept a Russian in the channel) I nearly jumped out of my skin – it was so loud and sudden. News papers said it was heard over 500 km2. Our roofer said he was on a roof when it happened and he saw tiles jump.
Also used to live in the West Country of the UK, and every night at about 9.00pm would get the double boom from Concorde 80 km away in the middle of the channel. Parents used to let kids stay up till they heard it because it would always wake them.