One time when I was a kid, me, my mom, and my step dad came home and found red writing on the wall in our bathroom that told us to get out. We scrubbed it off and wrote questions on a piece of paper that we taped to the wall, put a camera on it and nothing happened. Took the camera out and came back a few minutes later to answers written in the same spot the original message was.
Either there was a ghost writing shit on our wall, there was a ninja in the house writing shit on our wall, or my mom and step dad were fucking with me and writing shit on our wall. I don't remember leaving their side that night though because I was shook.
Still not sure what happened to this day. Although my step dad had gotten into an argument with our neighbor a few days before, could've been him but he would've had to have been hiding in the house somehow because of the response message, and then snuck out without us noticing.