I never believed them, but now I do.

I'm 7 years old. My sister always says that the devil is inside her. My parents, teachers, and even the priest say that she is only possessed by the devil, but isn't the devil himself. But sometimes when I'm alone with her and she sings that song, I hear the deep voice behind hers. I can't help but wonder if she's lying, and it really is the devil inside her. The song goes like this: Get out while you still can. Get out while you still can. Get out while you still can. Get out while you still can.