(To illustrate this concept, we offer the following [admittedly far-fetched] scenario: A man who received a flu vaccination and then accidentally hit his hand with a hammer a few hours later might legitimately report that soon after he received the flu vaccine, his hand began to throb painfully. Although such a report would be literally true, it would not establish any causal connection between the flu vaccine and the adverse medical symptom of a throbbing, painful hand.) Read more at http://www.snopes.com/medical/drugs/gardasil.asp