I have an across-the-street neighbor who "owned" a small white economy car(Dodge Neon).
I'm not close to the guy but I had noticed the white car no longer in his driveway for some time.
Yesterday morning I got off night shift at 6am. I drove home. It was still dark.
When I pulled up in my driveway I noticed the little white car parked in front of his house on the curb.
I also noticed a man who was NOT my neighbor going thru the car!

As I got out of my truck, looked at the guy HARD. He saw me looking at him. Definitely NOT my neighbor!
I did a dumb thing I think. I got mad.
I stepped into the street and said to the guy in no uncertain terms "Hey Bud, you got any business in that car?"
He told me "Its okay. My brother in-law gave me this car."
I asked(sternly)"What is your brother in-laws name?"
He replied with my neighbors name.
When he said this I calmed down and told him that it was okay. I just didn't know who he was and was concerned.
He was cool about it.
Reflecting on this, I beleive I did several things incorrectly.
1.) I was unarmed. I couldn't help this. I can not carry to/at/from my job.
2.) I acted too quickly. I got mad and stepped up on this unknown person.
3.) and most unsettling for me - I alerted the unknown person to where I live.

4.) I didn't call the police. I didn't think it was needed after I found out who the guy was.
What would you have done?