This is my entry for @stach's short story contest themed "horror"

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The Toilet

Lorna is a freshman at an old university. One day while in the middle of the class, she was suddenly called by nature. Lorna approached her professor to go to the toilet. Lorna chose the last cubicle in the toilet. When she sits, Lorna suddenly she feels that many mosquitoes are circling around her head. When she finishes using the toilet, she washed her hands in lavatory. She saw a janitress in the toilet, and she said to herself “Yes! Marta is here!”

The Toilet Source
Marta is a janitress of the university for a long time. Lorna said to Marta “Marta please spray the last cubicle because there’s a lot of mosquitoes in that area” Marta replied, “There is no mosquito in this bathroom because I always clean it”. Lorna suddenly felt annoyed and said to herself, “I felt those mosquitoes in my head” When Lorna out of the bathroom the old janitress said “The last part of this toilet, that’s the part where the girl saw hanged and died because of depression last year”

Realization: It was not a mosquito that circling at the head of the Lorna but the foot of the woman died last year.