You'd think Halloween would be one night where families could put their political differences aside and promote childhood diabetes. Unfortunately, for some anti-vaccination parents, the holiday has become a time to spread propaganda messages.

While some people believe that vaccines cause autism in children, scientists have not found a link between the two. But the National Vaccine Information Center (NVIC), which encourages parents not to vaccinate their children, wants anti-vaccine parents to put stickers on their Halloween candy advertising vaccines' "risks."

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The labels ask parents to "know the risk" of vaccination, encouraging them to visit the NVIC's website. There's no information, however, about the risk of ruining Halloween.