I was visiting a neighbor who had a blonde little girl living with them. She was possessed by some sort of demon. The demon had the ability to affect the world around it. It sent a zombie creature after us at night, it came after me until I figured out I could use holy water against it. My parents and the other adults were useless and didn't believe me until the demon caused these weird plants with purple flowers to spontaneously sprout in the garden. I wasn't sure what the plants could do, but they were squirting pollen or something at people, so I didn't stick around to find out. I ran out and saw a long line of people gathering at an alleyway between houses, where a girl and a guy I once knew were rationing out holy water to people. My dad went to get more.
A couple of times I tried to talk to the little girl. I would ask her if she was okay, what she was going to do, and if she was scared. If I thought the demon was the one talking, I'd tell it off, like "hey, I'm not talking to you, asshole. I'm talking to her."