The cartoon-like stamps are part of the Dudesons' anti-bullying campaign. Since it's the Dudesons, the stamps also feature practical jokes. There is a code hidden in the images of the miniature sheet, providing an easy way to view extra online content by using the Cee App and scanning with a smartphone or tablet. The Dudesons have uploaded brand new video material online to be accessed with the code. Read de Dudesons comment on their own stamp here: Read the article by Itella here