This experience happened when I was still in college, I think I was 18 or 19 years old and the year was between 2009-2010. This university is situated in a tree-filled place. If we are not mistaken, we are the only one who were using the fourth floor during that time as our professor comes from the province as he also teaches high school students and our university is situated in the city. This is the reason why our class was on the night shift.
We were in the middle discussion and our subject is Mythology and Folklore on the fourth floor of our 4-story building and our classroom is situated 2nd to the last room on the right side. It was around 7:30 pm - 9:30 pm and it is already dark outside.
While we are in the middle of the discussion and I happen to look on our front door, we have two doors in each classroom, one at the back and one at the front. It is ajar and there was no wind when suddenly a big black dress passed the door floating sideways looking inside our classroom with two glowing eyes as if she was mad! I got pretty scared and ignore it with all my might.
When the class was over, I happen to tell it to my classmate who was sitting beside that front door and she got really scared. That time that I saw that Lady, she was feeling really cold as if someone throw a bucket of ice-cold water at her.
It was one of the topics in our university that there was indeed a ghost on that fourth floor, specifically the last room beside us.
I thank God that nothing happened to us on that night.