Few things distract quite like seeing a set of breasts, especially if they catch your eye when you’re least expecting it.

Like, for example, when you’re driving a car.

A Moscow-based advertisement featuring a really nice pair of breasts is said to have caused more than 500 car accidents in one day, according to the Daily Mail.

The ad, which covered the nipples with a thin teal strip with copy reading simply “They attract” was placed on the sides of 30 trucks that drove around the city. As they made their rounds, cars started colliding with one another. And not just a few fender-benders, either. It’s believed that 517 accidents happened, all told, before police impounded the trucks.

The ad was made and distributed by Sarafan Advertising Agency in hopes it would show how effective ads on the sides of trucks could be.

“We wanted to draw attention to this new format with this campaign,” says a spokesperson for the agency.

So, mission accomplished.

The agency has pledged to compensate car owners whose wreckage costs are not covered by insurance.