Besides being a smorgasbord of new auto products, the annual Specialty Equipment Market Association (SEMA) show is also a gathering for car tuners and modifiers who want to show off their custom creations. Inevitably, some of the custom rides that show up to the Vegas show are incredible eyesores with unbelievably bad paint jobs. We found 20 of the ugliest cars on hand at SEMA 2011.

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