I had one of these yesterday.. just phone call but it was amusing.
He said that they were working in our neighborhood, and noticed that our roof had shingle damage, and did we want to have them come out and do a free inspection?
I told him no, that we just had our roof replaced three months ago. Which is true. And no, we haven't had storms since then.
He replied that they must have been looking at the wrong house, and hung up.