In Roald Dahl's Charlie and the Chocolate Factory, Willie Wonka mentions licking snozberries. What most people don't know is that in one of Dahl's adult books, snozberry is a euphamism for penis. He was slipping dirty humor into a kid's book for his private amusement.
"...The snozberries taste like snozberries..." "What's a snozberry?" "I'm a trifle deaf in my left ear, next time speak up!"