I do.....I have seen one on a couple of occasions in a pub that I worked in years ago. It was the strangest thing because it strongly resembled one of my colleagues.
One particular time, I was working in the kitchen and out of the corner of my eye, I saw a large lady with blonde hair. Thinking it was my colleague, I started talking to her, when I turned to get an answer, she was gone. My boss then walked into the kitchen and I asked him where my colleague had gone, he said that she wasn't working that day, so he had no idea who I had been talking to.
The same figure was spotted by a couple of us a few days later, sitting at one of the tables in the restaurant.....she wasn't there when we went back to check though.
I left the pub not long after these apparitions started appearing. I have lost touch with most of my colleagues from there, so I have never heard anything since about the mysterious blonde lady. Maybe she's a past diner who keeled over waiting for her dinner!