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JWT London created a billboard for KitKat that switched itself off in a bid to persuade people to "have a break" (get it?) from electricity.

On 24 March at 8.30pm, million of people worldwide switched off their electricity for an hour in support of efforts to tackle climate change. To drive awareness of the "Switch off" campaign, the choclolate brand's billboard, shaped life a KitKat finger, 'snapped' to break a circuit to turn off its power. 

The stunt was timed in concert with the lights switch-off on Tower Bridge, giving the illusion that it switched off the bridge’s power in order to reinforce the significance of the message.