http://en.wikipedia.org/wiki/Have_a_nice_day
Have a nice day
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Have a nice day is a commonly spoken valediction, typically spoken by service employees or clerks to customers at the end of a transaction, particularly in North America. This repetitious and dutifully-polite usage has resulted in the phrase developing a cultural connotation as a stereotypical display of impersonality, disinterest, or passive-aggressive behavior.
It is also the title of several creative works:

