At my old office got 2 incident that happen to my colleague. Thankfully not to me as I tend to not stay late hours and continue any work at home.
1. late hours, few of my friends were working suddenly all of them felt cold breeze swept by them and trigger goosebumps on them. they look over their cubicles walls and separated by a few cubicles, a lady with white-grayish tattered cloth & long hair seemingly standing over the cubicles. Even though they didn't see her face it felt as if she was staring straight at them.
2. 2nd incidents, one of the manager also work late hours inside his room with glass wall overlooking his staffs. Going through the paperworks, he noticed one page is dirty. he call one of his staff but weirdly the guy pickup the phone but says nothing. As he was walking out of his room he stops at his doorway and noticed that all his staff just sitting straight and staring blankly at the screen. He felt the chilling breeze and goosebumps altogether. Straightaway he decide to go home and walks in between the cubicles to the office doors. He tried very hard to keep calm but as he went by the cubicle nearing the office door. he felt something pulling his shirt asking whether his going back because of the time or because he knew it already.

I'll admit. I add the 'questions' part. Because as the story goes its not that interesting. My colleague and manager that 'Kena' is male and all of them run like hell to the guard house at the office gate at the end.