another wierd story : you are not alone

last friday morning, as a result of simultaneous water drinking in the morning, i needed to go to the restroom in the middle of chemistry lesson. so i permitted myself out of the class and headed into the girl's restroom.
the first year freshmen building where the lesson being held was quite an unique building. when you look at the building from above, it forms an octagon. each of the class was built theatre-like, the front row on the lowest elevation and the last row was on the highest elevation. because of this theatre-like structure, the building stood really high although it only consisted of three floors. there were two classrooms on each side of the octagon, and to reach the other classroom in another sections, you need to climb up and down several stairs (matched to the height of classroom elevation)on the top of these stairs was where the restroom located.
this building's restroom, i believed was designed improperly. no natural light. it is a really, really small room about 2x2 meters divided into two lavatories. it is possible that extremely morbidly obese person almost couldn't fit into the lavatory. both lavatories door were open, so i just went into one of them. i shut the door and started doing my business. soon after i closed the door,
BANG!
BANG!
BANG!
there were terrible noises in that restroom, outside my lavatory. it was the sound of door violently closed and opened repeatedly, combined with loud banging on the door of lavatory beside. i didn't think wind blows is a good excuse for this since the restroom was not exposed to open air. at first i thought it was people rushing into the restroom, but as i listened, the noises grew more and more terrible.
"what the hell this person is doing?" I thought so, when suddenly out of nowhere, a faint scent of perfume spread on the air around me.
the scent grew stronger inside the tiny cubicle until the point i couldn't stand anymore, so i pushed open the cubicle door to see what kind of bad tasted person who made loud noises and applied too much of terrible-smelling perfume in such early in the morning.

but there was no one. the other cubicle's door was still open. it was really silent, only the sound of water dripping from the tap inside the cubicle. there also was a scientifically incorrect thing occured, there was no freaking perfume scent outside my cubicle. that strong, irritating scent of terrible-smelling perfume was disappeared just like...nah, disappeared like that.

huh?
oh shit, there must be something wrong.

i rushingly stepped out of the restroom with uneasy feeling without looking back, and sat back on my desk inside the classroom. i told nothing to my classmate, although she asked why i had such weird expression on my face.
silently, i promised myself not to go alone into the restroom anymore...