Shampoo.  The first half of the word is "sham" - fake, fraudulent, untrue.  The second half is "poo."  Did whoever named hair soap think it was appropriate to term it as false crap?  Sounds to me like there was a bet involved somewhere.  Though I don't know who won, I have to believe the English speaking public lost.  Beats Truepoo, I suppose.  (Once again forefronting the question: "Is it better to pass or fail an idiot test?")