Emailed to me from another humor list (The Funnies)
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A pharmacy major was taking a course in Dispensing. One day they were discussing the various labels affixed to prescription containers, such as, "Take with food," and "Take with water."
At the end of class, the professor passed out a few sample labels.
Days later he noticed that one member of the class had struck one of them onto his chemistry textbook. It read: "Caution: May cause extreme drowsiness."