Yahoo has an article on unusual phobias today. Have a look and then either imagine a character who suffers from one of these phobias, or – being more inventive – make up a new phobia like at the end of the article, and have your character suffer from that instead.
Dialogue exercise
Use this line as either an opening or an ending for a dialogue.
“I told you I was leaving.”
Who is saying this? Who are they talking to? Try and keep the tension high and avoid extraneous words…