12 people becomes 13 people

Count the people on the picture. You should get 12. Wait for 12-13 seconds. The people will permute their organs. Count them again. You should get 13. Write the best answer to the question "Where did the 13th person come from?" to the fast comments. ;-)




Spoilers

Click the picture at the top for a colorful version of the same puzzle. On that page, you may also find an explanation.