 
                            
                        
                        
                        “Be careful about reading health books. You may die of a misprint.”
                                        
                                        Attributed to Markus Herz by Ernst von Feuchtersleben, Zur Diätetik der Seele (1841),  p. 95 http://books.google.com/books?id=FLc6AAAAcAAJ&pg=PA95&dq=%22Lieber+Freund+Sie+werden+noch+einmal+an+einem+Druckfehler+sterben%22. First attributed to Twain in 1980s, as in The 637 best things anybody ever said, (1982), Robert Byrne, Atheneum. See talk page for more info. 
Misattributed 
Variant: Be careful about reading health books. You may die of a misprint. 
                                    
 
        
     
                             
                             
                             
                             
                             
                             
                             
                            