Well, I would imagine that they are called "redheads" because "red" rhymes with "head", therefore making the label more palatable to the tongue. Interestingly enough, there are very few idiomatic expressions with the word "orange" in them. This makes sense when we consider that the word "orange" is probably one of the most phonetically distinct out of the many words of English.
At the same time, we should never rule out the possibility that such an expression might be included in the future: Take for example something like, "Hey! You stepped on my toe you orange orangutan!" (My apologies to all gingers in advance.)
Now then, things that I do not understand...
That's kind of a problem. I have the rather unfortunate tendency to search for answers to mundane stuff. Usually, if I can not find a direct answer at present, I substitute the most plausible-sounding answer by default.
As an example: Why do snickers bars have those strange patterns on the bottom of their chocolate shells? I might imagine that the method in which they are made has something to do with it. Given that it is likely snickers bars are mass produced in factories, I would probably imagine that the designs on the conveyor belts impress themselves into the snicker's bars or something like that. I can only imagine a conveyor belt would have to have some sort of grooves in order to improve traction against a slippery substance such as warm chocolate.
At the same time, this is complete conjecture on my part. I really have no authoritative source. It seems plausible enough, though.
However, in the spirit of jolly good fun(Oh wow I love jolly good fun.
), please allow me a few minutes:
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Got it. Why the hell haven't they made a Legend of Zelda Movie yet? This, I do not understand.