BERLIN, GERMANY - DECEMBER 04: A guest shows tattooed sign 'unbreakable' at the Berlin Tattoo Convention at Tempelhof Airport on December 4, 2010 in Berlin, Germany. The Tattoo Convention takes place for the 20th time. The organizers expect over the three days over 15,000 visitors. There are artists from Japan, China, Taiwan, USA, Canada, Australia, New Zealand, Tahiti, Samoa, and from all European countries as guests, who come up with the latest technics, designs and color creations. (Photo by Carsten Koall/Getty Images)

A young Palestinian crawls under a barbed wire during a military-style exercise at a summer camp organized by Islamic Jihad movement, in Khan Younis in the southern Gaza Strip, August 13, 2015. (Photo by Ibraheem Abu Mustafa/Reuters)