There is a suburb of Vancouver called New Westminster. Starting in 1870 they have been firing a "21 anvil salute" on the Victoria Day long weekend in May. (some histories say it was the fire department - the 'Hyacks', others say it was the Royal Engineers) It started as a way to honour the then Monarch, Queen Victoria, when you didn't have cannons (Monarchs would traditionally get a 21 gun salute on their birthday). It has continued every year since (140 years now) because blasting anvils is fun.
The New Westminster anvils only use 2 oz of black powder, so no major air time. On the other hand the fellow lighting it off gets close and uses a long stick to set it off. No 'light the fuze and run'.... as soon as the light on the stick touches the powder its' BOOM time. Twenty One times.