J.R.R. Tolkien Made Me Snigger Like A Schoolboy

I was reading The Fellowship of the Ring on the train to work this morning. I am up to the part where the Company is about to leave Lorien. It is a sad and somewhat solemn occasion. They know they are leaving the peaceful and beautiful Elven haven to journey into fear and darkness.

Galadriel is describing the lands that they will soon journey through. They will follow the river Anduin as it flows southwards until it falls over the cataracts of Rauros into the Nindalf, which in the human tongue is called the Wetwang.

And this was where I started sniggering like a schoolboy.

Wet - adjective: moistened, covered, or soaked with water or some other liquid
Wang - noun: vulgar slang for the penis.

And the fact that she mentioned 'tongue' in the same sentence just clinched it for me. :)