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.

>>18
It's the "let's have lots of keywords instead of difficult mathematical-ish operators" school of language design. Too bad it makes code almost impossible eyeball.