Borussia Dortmund's Roman Burki has a very unusual pre-match ritual

Dortmund's official YouTube channel has taken the opportunity to edit all of their first-choice goalkeeper's pre-game rituals into one video. It's certainly... unusual. 

Before every match, when the two team captains go up for the coin toss, the Swiss goalkeeper creeps up behind the referee and either steals the ball off the officials or one of the mascots.

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