Why do general people take pictures of the back house?

Greetings101

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Apr 26, 2011
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That came across my mine first but after thinking about it. The moment I seen this person from inside my kitchen window he didn't seem well dressed as in a suite or tie but in jeans and a loud top and that when he noticed me watching him he turn and when to the side of the tree where it would be harder for me to watch him.
Just makes me wonder what his intension are.