The ARSE (Asshole Rating Self-Exam), based on Bob Sutton's book "The No Asshole Rule" was used more than 180'000 times.
Don't be an ass, go do the ARSE now.
It only takes 5 minutes. If you did it before, find out if your score changed.
Today my score was 3 (0 to 5 points: "you don't sound like a certified asshole, unless you are fooling yourself"). In March 2008 my score was 4. I had just quit a job that I loved very much but I badly needed a change. In December 2007 I scored 5 ("borderline certified asshole") and was looking for a new job.
Conclusion: The ARSE may not be scientifically valid, but it's certainly interesting.