U.S. Government Grant Office Mike Watson ponzi washington, District of Columbia

I got a call on my cell phone from a male with a heavy accent (unable to identify where he might be from).  He said his name was "Mike Watson" and that he was with the U.S. Government Grant Office.

He said I should go to the nearest Walmart store and purchase a "Green Dot Money Pak" reloaded scratchoff card.  Activate it and put $150 on it and call him back within the hour at 202-621-0086, ext 104.  He would put $5000 on it and then I could take it to a bank and cash it for $5,150 (including my original deposit).  

I went along and listened to him to collect as much of the scheme that I could without giving out any other personal information.  I figured it was a scam and never fell for it. Just a heads up warning.  This is the first time I've experienced this kind of a call.