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There is definitely a difference between "He is a most unusual person;" and "He is the most unusual person I have ever met." "A most," while not that common in American English, implies that there may be others who are unusual, and he is simply one who exhibits this trait. Americans tend to use "very" in such a sentence-- he is a very unusual person; but in British English, you might still hear "a most". As for "the most," this is a definite statement, meaning there is no-one else who compares. This is the most fun I have ever had (there is no comparison-- it's the best, in other words).
Which house?
most extraordinary, more extraordinary
more unusual, most unusual
My house.Ha...haha...
What is unusual about most of the rivers in Mexico? *
more unusual, most unusual
more unusual, most unusual
the most unusual thing a computer can do is fart
Obama.
monkey