12 or 13 people?

12 people magically become 13! Can you solve the enigma?

http://blog.debreuil.com/archive/2006/01/14/3997.aspx

---------- Forwarded message ----------
From: João Spencer <joao.c.spencer@...>
Date: Nov 10, 2007 7:16 PM
Subject: Não percas este!