In 2009-2010, my 4th grade year, I had a ghost experience at my brand spanking new elementary school that opened in 2008, where I went from 3rd to 5th grade.
What started out as a normal school day in the September turned awry when I had the sudden urge to go to the bathroom. Well, I did my business and then respiked my hair in the mirror. Then it happened. I saw a 6' tall figure in a white robe walk toward a stall and thought, "Well, that's awkward" so I spun around really fast and guess what? Nobody was there!
I walked in class and everyone was dumbfounded on how mortified I looked by just a simple "bathroom trip". Either way I named this entity "Billy".
In December, a few days before Christmas break, our school had a fire drill in the pouring rain. Fire trucks came so maybe it was Billy checking up on us. I don't know if it was a student prank so I might rule this scenario out.
Fast forward to Spring. My friend Hunter was looking in the mirror and saw a pale white face peering into the bathroom from the entrance. Our reading teacher believed us but our regular teacher didn't for some reason.
Now I'm going to move away from the 3rd grade bathroom to the 5th grade bathroom. Occasionally when I was in the bathroom, the hand dryers would go off randomly. They have hand sensors so it can't automatically go off. I've heard the hand dryers go off multiple times, and due to my seat facing the hallway that contains the bathroom entrance, I can say nobody walked in or out at those times. So maybe ol Billy is a prankster after all.
And in my last year of middle school (2013-14) a friend of mine had the stall door slam violently behind her. Now I heard rumors of someone dying after falling from the rafters there shortly after it opened in 1991.
I am in my second semester of 9th grade and I haven't experienced anything significant, but I heard a small bell ringing once, and guess where it was? The upstairs bathroom.
So ghosts love bathrooms it seems. Maybe they have a bigger vantage point in the bathroom to mess with the kids, because there's usually only one way out of the bathroom: the entrance.