From Wikipedia: Serendipity is a propensity for making fortuitous discoveries while looking for something unrelated.
Now and then you find a really good word for something you never thought had a good word for it. I like the way this word sounds, like the slippery curved back of a sea serpent snaking up and down along the waves.
Think about looking for something online, reading a few blogs, sites and forums then finding something else that just takes over your full attention, something you never would have found otherwise. This happens to me quite a bit. I find new art forms, new ideas and names for things I had an interest in but never would have guessed others are actually involved in enough to give it a name, like urban exploration, ASCII art.
Write a scene where your character has a chance discovery, a case of serendipity.