If you've got a job interview coming up, Monster.com has a good tip for you:
Write down and memorize three achievement stories.
Tell about times you've really felt proud of an achievement at work or school. These stories demonstrate all those hard-to-measure qualities like judgment, initiative, teamwork or leadership. Wherever possible, quantify what you've done, e.g., "increased sales by 20 percent," "cut customer call waiting time in half," "streamlined delivery so that most customers had their job done in two days."
If the only thing you can think of is how your initiative and efficiency helped organize a beer-pong tournament, just make sure you point out how time to inebriation was cut in half and level of party awesomeness was raised 20 percent.