It's the traditional sound which has greeted the start of children's sack races, sprints and egg and spoon challenges for generations.
And when Gartocharn Primary School in Dunbartonshire secured the services of the London Olympics chief starter for their own sports day, the school must have thought it would be an extra special occasion.
But the school had not reckoned with the administrative power of health and safety council officials, who banned Alan Bell from firing a pistol at the event in case the sound frightened the school's children.
In an even more bizarre move, the council's solution was to play a recording of a starting pistol from an iPod, before it was eventually agreed that Mr Bell could use a klaxon instead
Parents of pupils at the school have branded the ruling 'ridiculous' and accused the local authority of 'tying themselves in knots'..
One parent, who did not wish to be named, told a Sunday newspaper: 'It was ridiculous. We were told that the children would be distressed by Mr Bell firing his starting pistol.
'Anyone who believes they would be frightened by a starting pistol has never experienced the noise at a typical three-year-old’s birthday party.
Thanks to David for providing me with my morning laugh.