Eight young men, clad in hi-vis vests and hands shoved sheepishly in pockets, have gormlessly blocked the way at Brewery Füchschen in Düsseldorf. Big mistake. It takes around 15 seconds for one of the pub’s waiters, kobes, as they’re known here, to offer a short, sharp rebuke. It’s the Rhineland equivalent of “mind your backs”, but less delicately put. Stag parties getting in the way at a pub?