Joseph McGrail-Bateup, an air conditioner cleaner and honorary town crier, yelled “now” at an ear-splitting 122.4 decibels. That’s about the same as a clap of thunder, a chainsaw or a pneumatic drill. The 58-year-old said it took him seven attempts to break the record and that his voice was “shot” for days afterwards. “There’s no way that you can actually practise for it,” he said. “You have to just keep it for the day, especially with the world…