I have two stories. I heard from my sisters.

#1:
This was few decades ago when my grandfather was young. Our old home was near airport. At that time one of our relatives got a baby and she was hospitalized in Patan Hospital. So,my grandfather got a responsibility of taking care of her dinner. He used to take his bicycle (budho cycle) all the way from home (airport) to Patan hospital.

One of those nights as he was coming back to home.........
(AT THIS PIONT, I would like to mention that how Kathmandu was at that time. As I heard from old fellows, jackles used to move around...lots of trees....less people)
So, as he was returning back from Patan Hospital to home riding on his bicycle .....he saw a lady on a white sari. He saw her from the back as he was paddling his bicycle on the UKALO from TINKUNE to AIRPORT. Dark night....ALI ALI CHISO....both sides lots of tress unlike the current scenario.
So, he saw this lady. He got off his bicycle and called her from back and offered her a lift if she wants (as it was too late for a lady to roam around at night). My grandfather was also afraid at the same time while offering her the lift. However, as she turned towards him.............
He felt different and surprised by the fact that how beautiful she was. He, now, could not move his eyes from her.

She said,"Sure. that's so nice of you"

Now, she is on the back (carriage) of the bicycle and he's padding. After few mins, on the way, he happend to roll his eyes down to the cycle chain. He saw the feet of that lady was facing to other direction. TYAS PAACHI TA BAJE LE CYCLE ROAD KO SIDE KO JHYANG MA PHYALERA TAAPP.

As he reached home, he got fainted. Then, all family members were dead-scared. They called gurju and he did phuk phak for a month re. Only after a month, my grand father got back to normal and he told that story to others re.

#2:
...this one sounds more scary coz it happened to our generation (my KAKA's son). so this is first hand story. will come soon....... with #2....