Stop in for a cup of coffee

Did exactly as I would.
Its not any different than someone going up on a porch here or around back of the house 'just looking' for trash. Sorry pal. When its out on the sidewalk with a 'free' sign on it, its all yours. When someone is looking around the property, they are acting like a potential thief. The last thing they ought to be doing is opening doors or the hood. Knock on the door is OK, but he shouldn't be surprised by your response. He would have done a lot better if he showed some interest in the situation rather than that his main interest was taking it. Some people think everything and everyone can be bought.

When I lived in Detroit, we came home one time and found a guy inside our enclosed porch... He climbed through one of the open windows and was looking around... I asked him what he was doing and he said, "I'm just rummaging"...

I let my two Dalmatians and Black Lab mixed with an Irish Setter out in the back yard to keep him there while I called the police and had him taken away.... The dogs blocked any escape route that he had... The Dalmatians were a good 60 - 65 lbs each and the Lab was a good 95 lb... They stood and barked at him to keep him in the porch while the police came....

Luckily we kept the door from the porch to the house locked all the time... Plus the dogs had free run of the house and wouldn't let strangers in....