The Hardest Language

Some Asians said English is the easiest language in the world, and some said it's the hardest. It seems the problem is subjective.
Don't ignore the native American languages, Middle Eastern languages and African languages!

Here is an attempt to objectively measure language difficulties: http://claritaslux.com/blog/the-hardest-language-to-learn/

Instead of finding the hardest language, let's find the hardest grammar, hardest writing systems.

I'm personally having trouble with Japanese and Objective-C.
Japanese is apparently really easy, but I just can't grasp it.

I hear English is really hard though.

Here are the hardest grammars:
Greek
English
Here are the easiest grammars:
Chinese
Japanese