What is the hardest language to learn?

[xBlueXFoxx]

Well really there isn't a special language that is the most hardest in the world to learn, it can be proven by statistics, but definitely will never be a fact. Saying this I mean everyone will have their own personal opinion on which one is hardest, for example: I would say the hardest to learn is either dutch or Japanese, but for others it may be very simple for them to learn.