There are now defibrillators, for public use, in the metros in Copenhagen. The public is important in saving lives, or something to that effect.
Will the machines be used for pranks? Will they work? Will the public understand the machines? Will they “play heroes”?
Make up your own mind about this, because when your own heart fails in the CPH metro, some stranger who stands next to you might come to your rescue with defibrillators crackling.