I had a creepy experience one time while assigned to work in the nursery at the hospital. The room was packed with about 15 cots, each with a baby in it. One of my colleagues had asked me to bathe one of the babies in her care while he was in the nursery - his mother had gone for a shower and she didn't want to leave the baby unattended.
So I set to looking around for this baby, checking the names on each bassinette, when suddenly I hear a male voice call my name. I turned around toward the sound of the voice, but nobody was there. However, right in front of me was a baby who was silently choking and gray in colour - it was the baby I was looking for actually - and I grabbed him and brought him to the resus area and started resuscitation efforts and then pulled the emergency alarm to bring more help.
That was probably 13 or 14 years ago. I was still a sort-of believer at that point in time and it gave me the heebie-jeebies, as did a lot of other weird stuff that happens at the hospital. Now, I'd probably ascribe it to the fact that I had been working a string of nights and still had young children who needed my attention after school, so I was quite sleep deprived.