Funny story of Schalke - Dortmund Derby i didn´t realise watching it in Tv but a friend told me today ( he is schalke fan, was in stadium):
Two years ago, three or four days befor Derby, Schalke Ultras caved into Dortmunds Stadium, and climb on the roof. From the roof they lower down with ropes and steal one of the huge "Yellow Wall" banner of Dortmunds Ultras that are installed in the stadium.(60m wide, 2 m high)
They hide it in an old gardenhouse from an unknown Schalke Ultra. Two years no one knows were it was, Police and Prosecutor searched but can´t found it. Most were sure that Schalke had done that, and if not Schalke maybe Bochum.
Now yesterday, during the Derby, the Schalke Ultras bring it to the stadium torn into pieces. Think it was in the second half they picked it out throwing the pieces around and wave them while singing: Die gelbe Wand, die gelbe Wand, die gelbe Wand ist wieder da! (The yellow Wall, the yellow Wall, the yellow Wall is back again!)