Borussia Dortmund players turned ball boys in the first half of their German Cup quarterfinal clash against Stuttgart Tuesday, after hundreds of fans threw tennis balls onto the pitch in protest at high ticket prices.
German football is known for being among the most affordable in Europe. However, the Dortmund fans' frustration stemmed from a quarter of away tickets being priced at €70 ($78.80) and the cheapest seats costing €38.50 ($43.40).
The fans also boycotted the first 20 minutes of the match and began raining tennis balls onto the pitch seven minutes later.
A banner unfurled at the start of the match read: "Football must be affordable."
Last season's beaten finalist Dortmund progressed to the semifinals of the German Cup with a 3-1 win thanks to goals from Marco Reus, Pierre-Emerick Aubameyang and Henrik Mkhitaryan.
The two teams also held a minute's silence prior to kick-off in memory of those who lost their lives in Tuesday's train crash in Bavaria.