我不相信

依照可信程度排列
Provable->believable->debatable->queationable 最不可信

Do you believe me?
Why don't you believe me?
->You must be joking ! (說 lying 較不禮貌)

其他說不敢相信的說法

• That sounds like a phony story.
• You have a wild imagination.
• I don't believe you.
• Get out of here.
• That seems questionable.
• You've got to be kidding.
• I doubt that.

我們常說的 Unbelivable 其實是 amazing, awesome 的意思
別搞混囉