This happens to me alot also.

I have dealt with this by coming to an understanding that these things happen as they do because I am aware of my surroundings and in tune with what is taking place.

I am better equiped to respond appropriately and enjoy toying with it on occasion.

It is wise to keep it under your hat as it does come accross as bizare behaviour.

Personally I believe that a healthy dose of paranoia is a good thing as it keeps you on your toes.

be blessed.