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San Francisco, California (CNN) It's apparently the city version of cow-tipping.
Authorities in San Francisco are looking for a group of vandals accused of over-turning at least three smart cars early Friday morning.
Police say the suspects wore black-hooded sweatshirts.
Here you see shots of the tipped two-seat, German-made vehicles.
Officials say they weigh about 16-hundred pounds... and are relatively easy to tip.
Smart cars are popular in areas like San Francisco, because of their gas mileage and they're easy to park in tight spots.
Car-tipping is classified as a felony vandalism.