This happened to me a lot of time. I'm getting sick of it. But when i saw it the first time, it was scary.
Every night(espically on Thurday nights), I felt someone tracking from behind me. When I look back, there's no one there but there's shadows, a shape of a human. When I look back again, I saw.....it looked like devil and it's scary.
After I met the bomoh, I don't experienced it anymore Believe it or not, it's up to you.