Federal Government Grants Department ripoff Phone call in the evening declaring I have been selected for a grant Nationwide

I was called this EVENING and informed by a foreign speaking individual that I was selected in a batch of 20,000 others to receive a $10,000.00 no interest, non-taxable and no need to pay back Federal Government GRANT. He (nameless) told me,upon my asking him, that he was indeed an employee of THE Federal Government of the USA. I was supposedly given his supervisor to speak to and was told again in broken English that the grant was mine yada yada yada and that I was being transfered to an office in Washington, DC for verification. When I told him he sounded more like a very bad, non english speaking salesman and that I was not in the least interested in his scam (since I am in the Do-not-call listing) he told me in what I can only describe an Indian (ish) accent to "go to the H**l".

I checked my caller ID and the number is as follows:
251-634-5885. Of course it is unlisted and nothing shows up on several reverse lookup searches.
I trust this is not a legitimate offer since I could use the free money, but more than likely it is not.
I hope no one falls for this if it is truly a scam.

Kevin
Crofton, Maryland
U.S.A.