With the Batman movie out I want to ask... What is your greatest fear and why?

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Bats anyone? I'm interested in knowing peoples greatest fears. Is your greatest fear an object a living thing, or an just an event that could happen? Is there more than one fear? Why is this your greatest fear? I'm a very loving and social person so mine is being alone with no friends, family or boyfriend. Or just ending up alone by never getting married. My other fears are people breaking into my house at night, global warming, and the dependancy of oil. I'm starting to learn a lot about the last two things so it's starting to scare me.