Disclaimer: Tolkien's the genius, not me.
Nothing pleased him more than catching Lady Galadriel off her guard. Like giving her that name (which fit her far better than Artanis anyway), or presenting her with unexpected flowers.
Now they were alone in the garden, the only light coming from the stars and from a candle in a nearby window, turning the fountains to molten diamond and gold. Galadriel was speaking of Nargothrond, and how happy her brother was with its progress. It was all very interesting, but Celeborn had stopped listening.
When she turned to ask him something, he leaned forward and caught her off guard again.