7. Jenny McCarthy

Jenny McCarthy has two scary sides: Her acting and her beliefs about vaccines, although both are open to debate.

Pretty much everything she's done on TV or film has been scary bad, from "The Jenny McCarthy Show" to "BASEketball" to "Witless Protection."

To some, McCarthy, who has an autistic son, is a brave voice in the fight for responsible use of vaccines. To others, she's harming children by making claims that vaccines cause autism despite medical evidence to the contrary. (AP)