While not actually eerie, it was probably the most scared I've ever felt in a moment.
When I was about 13 or 14, I woke up in the middle of the night needing to go to the bathroom. I had one of those bunk beds, but where instead of a bottom bunk there's a desk. For whatever reason, I started psyching myself out REALLY badly. I sat up in my bed staring into the pitch blackness, imagining a man with a knife standing under my bed ready to kill me as soon as I put a foot down the ladder. Or a torn-face ghost girl in the hallway. Or someone smiling and bloody at the turn into my bathroom. Basically the usual freaky images. I tortured myself for a solid 20 minutes, then used another 10 to try and convince myself of being stupid and go to the bathroom.
When I finally felt ready, I carefully stepped down the ladder, holding my breath, ready to feel my foot get harshly grabbed. I continued to the bathroom, slow and completely on edge. Well, I guess my mom was going to the bathroom at the time too, because she was RIGHT there in the hallway and she bumped into me. For the state of mind I was in at that time, getting bumped into just set me over the edge. I collapsed in the hallway in shock, started crying, and peed all over myself. My mom was stunned and apologetic, but not without a great deal of laughter and mockery first.
TL;DR: My mom is.