Creating your own programming language

Has anyone here every created their own programming language? What was the syntax like, and what did you use to implement the language? Using Haskell to implement your language is cheating BTW, so don't even post here if your language is made from Haskell.

Mine is the best

Public Shared Function AreYouAFag(ByVal You As Person) As Boolen
   If TypeOf(You) Is Fag Then
      Return True
   End If
   Return True
End Function