This is a simple version of the classic game Hangman.

Wade Wegner created this simple version of Hangman in the process of getting his feet wet in Silverlight and the Visual Studio Orcas.  He mentions on his blog that it only took him three hours to bang this out:

http://blog.wadewegner.com/2007/07/23/SettingUpASilverlightDevelopmentEnvironment.aspx

When the game first comes up, simply press the key for the letter of your first choice.  You know the rest ;)