Once when I was 11, my sister and I were home alone when we heard someone breaking into the house. We went to the kitchen where we found Grandma, who didn't know we were home and was just coming by to check out the renovations my parents had done to the house. Come to find out later in life that she often would stop by when no one was home. There was some trick to breaking in the back door she used.

Also, later on we learned the next door neighbor used to go in our back yard all the time. When he got dimensia as he got older, he forgot to try to hide it, and would just come back there acting like he owned the place. He wouldn't really listen when my parents tried to kick him out. He acted very offended and would make comments on their yard care.

Dude, people are crazy.