Would you be surprised, if your neighbor was arrested?

I have lived in the same house and neighborhood for 41 years. People come and go, but we are still here to stay. Three years ago, a grandmother moved into a house, located across the street from my house and down about four houses. Shortly after her move-in, I noticed her teenage grandson was also living there. I was not suspicious of him, until he began to walk the streets at all hours of the day and night. I knew he had a criminal record and this really aroused my suspicions. Two days later, there was a home burglary on the next street over from mine. Guess who was the burglar? It was him. He served about a year and was released. Within the past two months, three or four fast food restaurants have been robbed in my area. I did not suspect this person, because i thought he was still in jail. Not! I was totally shocked when my police buddies advised me that he was the armed robber of the restaurants.Question: do we really know our neighbors? Have you had a similiar situation?