Blow horn

"We could stand outside with a blowhorn and say you are all sinners but the reality is that doesn't work," Mr Davies said.

"Pick up your toys" takes a parental blowhorn to permeate the brain of a young child.

He remembers the sad, droning sound of a blowhorn from a dredge barge, a plea for help as it was swept out to sea.

[F]rom atop enormous snow banks they sang civil rights-era songs and waited for the speakers from inside to come outside to deliver their speeches via blowhorn.

I’m talking, of course, about the vuvuzela. Essentially, a metre-long blowhorn, which you may struggle to get past a steward at an English football ground.