Sometimes it can be difficult to choose a really good title. Like puzzles they should provide clues or hints to what lies ahead.
I usually keep things simple, for flash fiction and short stories, a single word, or two at most. It isn't often I'll go for anything lengthy, and I definitely don't feel comfortable using whole sentences.
I'll try for something relevant to the storyline, a keyword is often enough to spark an idea.
When writing a longer WIP, I'm a bit quirky, I need a working title to begin. Doesn't matter if its not exactly right but I must have one in place. Something meaningful to the theme of the story, which will create a tone, the title needs to communicate something to the reader.
How do you select yours?