"Do not speak to me of dragon fire"

[Inziladun]

Originally Posted by Zigûr

There is (to the best of my knowledge) nothing in the real story from the books to suggest that Thranduil had ever encountered dragons in his life, although I suppose it's possible.

Maybe in one of the First Age battles involving Glaurung?

As has been clearly demonstrated though, movie writers need not stick to the source material for 'inspiration'.