You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: MY CHARLEMAGNE MAN 
Clue: For 46 years Charlemagne was the king of these people who gave their name to a country
the franks

Category: DOUBLE DOUBLE LETTERS 
Clue: You're blushing--I hope I haven't done this to you by telling that story from when you were 6
embarrassed

Category: "W" 
Clue: A system of pipes & reservoirs, or a flood of tears that may be turned on for sympathy

waterworks