I saw a nice RV coming into the park we are at, I caught thier FMCA number and looked them up here, While they were getting set up I approached them and called them by name, I don't know what happened, they went into thier rig and closed the drapes, every so often I would see them peek out.
After I left, they came back out and finished setting up.
They never did find out how I knew their names, because every time they saw me they would cross the street and look the other way.
I have done this a couple of times, with some strange reactions until I explain how I do it.
Made some good friends too.