Science

No I was using this definition:

"Anecdotal evidence consists of personal experience or narrative used to draw a conclusion or make a point."

If you are asking my opinion on the matter, I would think that a person who has their birthday tattooed on their chests has a high probability to be a narcissist. It could of course be another sentimental issue like mother dying during birth etc but nothing I could see indicated this for the particular example.