I often (~monthly) believe that my name is being called when further investigation suggests otherwise. I believe it is a result of a similar sibilant sound and my upbringing. My stepfather insisted that if he shouted my name I had to come running, even if I was out of earshot blocks away. Thus I was "nurtured" towards false positives.

This audio hallucination always fools me, but visual hallucinations never do.

At approximately the same rate (monthly), I imagine I see a cloaked figure. This is more an optical illusion in my peripheral vision, which I quickly recognize. Occasional Melatonin or Vitamin D greatly reduce the occurrence of this optical misidentification.