My friend lived in the oldest house in the town we lived in. Her house was the first house to ever be built in the town. So we always made jokes about it being haunted as hell and how we could hear things. It never really scared us but we didn't dare taunt them either.
She would have some weird dreams where she couldn't fully wake up, but there was a dark figure leaning over her. One night when I was over (I slept on the floor) she asked me the next morning if I had sat up for a little while. I of course told her no, that I had actually slept pretty well that night. Her face went pale telling me she woke up in the middle of the night and saw someone sitting up right, right where I was lying and sleeping. Mostly at night stuff happened, when you're barely awake, but one day it was the middle of the day and we both saw it.
She and I had been hanging out and I was bringing her home. It was about 2 or 3 in the afternoon, so it was daylight out still. I pulled into her driveway and she said she wanted to wait to make sure someone was home so she wasn't locked out. So she texted her mom and her dad and we jammed out in my car while we waited for a response. Then we saw her mom look out the window at us, probably heard my music, and we both waved to her; "Oh yup there she is!" my friend said as she gathered her stuff and began getting out of my car. We said our goodbyes and I made my way home.
Once I got home I noticed I had a text from that same friend and it read;
"So the door was unlocked and I came inside and nobody is here. I looked EVERYWHERE in this house. You saw my mom look out the window at us too, didn't you?" I did... I had some issues staying over night there for a little while after that. Not to mention a year or so later, her mom called us freaking out wondering where we were one day, because apparently she yelled to us upstairs asking us if we were hungry for dinner and if she should make something and we answered. Then when she went up the stairs to talk to us, no one was there.