Da Fan shows a sign 'Warum?' according to Mats Hummels during the Bundesliga match between Borussia Dortmund and VfL Wolfsburg at Signal Iduna Park on April 29, 2016 in Dortmund, Germany.
{"Image ImageDescription": "DORTMUND, GERMANY - APRIL 30:  Da Fan shows a sign \"Warum?\" according to Mats Hummels during the Bundesliga match between Borussia Dortmund and VfL Wolfsburg at Signal Iduna Park on April 29, 2016 in Dortmund, Germany.  (Photo by Sascha Steinbach/Bongarts/Getty Images)", "Image Copyright": "2016 Getty Images"}