I thought I would share this wonderful site I found. I do not know just how accurate it is. I do know that a few of the phrases are definitely right (mae govannen for one).

But what I love about it is the wonderful section of Elvish insults.

For example:

"Auta miqula orqu" or "go kiss an orc"
"Llie n'vanima ar' lle atara lanneina" or "you're ugly and your mother dresses you funny."

Like I said, I'm not sure on just how accurate it is but it is certainly kind of funny! And I, for one, can sleep better knowing that I can now tell someone to listen to my laughter!