My husband was telling me a joke while my 7 year old son 
listened.  In the joke is a line about a barber being told *not* to
put hair tonic on the customer because the customer's wife 
would think he'd been to a whorehouse.  Another customer 
tells a second barber to go ahead and splash it on -- his wife
doesn't know what the inside of a whorehouse smells like.  
My son turns to me and says, "Do *you* know what it smells
like, Mommy?"