The type MD is talking about is almost assuredly psychological coincidence. Kind of like when a song comes on the radio that you were just thinking about. What you don't realize is that thoughts like that are fleeting and you forget about them seconds after you have them. When an outside catalyst validates the thought, it seems eerie or strange, almost like a sixth sense or a psychic power. Ergo, normal people probably have the thought
(possibly stemming from what cheebs said) that someone/thing could possibly be watching them several times a day. The validation is when you turn and actually catch someone who was checking you out. That gives the creepy feeling that you get.
Same thing with the song example. When I'm listening to the radio and a song comes on that I was just thinking about, I get that "Wow, that's crazy!" feeling. The thing is, I have bits of songs going through my head all the time at different times of the day. If you listen to a radio station that plays music that you listen to, chances are it's going to happen fairly infrequently at worst.
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