Dream About Possessed Prank Gone Wrong

I had a dream about where I was really skinny and my little brother made a comment about it, my mom is very religious. I decided to prank my little brother to pretend to be a monster. I was in a basement and it was really big and it was dim. I started shaking and growling like a monster to scare my little brother as a joke and he yelled for my mom to come down to the basement. She thought I was possessed and tried to do an "exercism" on me and I decided to play along but I started to get really stressed out and for some reason I couldn't get my mouth to close