Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.

[Q]: Question: Could you tell me some suitable idioms to express this situation: A guy told you a joke, but it's not funny at all. In Japanese, we say "He slipped" or "His joke was so cold that the air got frozen," for that situation. Are there any similar phrases in English? 
Answer: A common expression for this is to fall flat (from the "idioms" section of thefreedictionary.com): fall flat if an entertainment or a joke falls flat, people do not enjoy it and do not think it is funny Several attempts at humour during his speech fell flat. if an attempt to influence people's behaviour or opinions falls flat, it fails The advertising campaign which had worked so well in the US fell flat in China. The statement that pregnancy is not an illness falls flat with many morning sickness sufferers. The first meaning is the one you're after, so you could say: I told a joke but it fell flat.
[A]: yes


[Q]: Question: Ok, if I say "this car is too expensive" or "this car is very expensive", then I can not express the connotation of "expensive". However, if I say "this car is damn expensive" then I better convey the connotation of "expensive". So my question is: What is the English idiom about "expensive" that expresses the idea that "It is so expensive that you feel like you got ripped-off and/or overcharged and/or unmeaningfully expensive"? For example, "damn expensive" could be ok but is there any other term? 
Answer: exorbitant is also used for extremely unreasonable prices. An example of using it, quoting the Oxford dictionary: some hotels charge exorbitant rates for phone calls.
[A]: yes


[Q]: Question: I'm referring to the peculiar habit I sometimes see in formal documents, where a number is given numerically after it's spelled out. It seems quite redundant: I need five (5) kumquats, stat! (Though it isn't always in a legal context, might it be related to this answer on this question?) 
Answer: I looked into this myself recently and couldn't find a definitive answer. The best I came up with was that numeric values in a formal document or contract are often crucial to its purpose. Restating a number in parentheses after spelling it out is a way to ensure the reader that the number is correct. It also draws the eye to the numbers, allowing for quick perusal of a document, say a purchase order. These are practical reasons; whether there is some historic reason for it I do not know.
[A]:
no