It's gimmicky but the Drunk Mirror could prevent potential drink-drivers from getting behind the wheel.

The mirrors, created by a Brazilian ad agency for insurance company Allianz, look just like regular bathroom mirrors, but are actually fitted with a camera that feeds a high-resolution reflective video screen.

Instead of having a perfect reflection, the mirror pauses for a short moment before changing. After showing the person a delayed reaction for a few seconds, the mirror then flashes up messages about drink-driving, such as: "This is how slow your reflexes are after only a few drinks".

The tag-line for the campaign is: "Getting home safely starts with a good look at yourself".