I too have experience this very phenomena.
Once I was taking a shower after work aka prostitution, and a chill quivered down my spine. Hmmm, must've been a draft of wind. But then a bizarre sensation over took me yet again... it was as though someone was behind me. But I had soap in my eyes!!! Oh noes! With a plethora of pain, I opened my suddzy brows, turned around... and saw... air. Whatever, nothing to worry about.
I went back to showering, finished up, and opened the shower curtains. Oh fuck! my pimp was there. And he was angry! I got slapped up and told to get my ass back to work.
Ahh, those were the good ol' days