
Back in the day, a tree trunk studded with iron spikes blocked the Spree every night. Anyone bringing goods into Berlin had to pay customs here, and smugglers tried their luck. That's where the Oberbaum Bridge gets its name.
One of you becomes customs and waits at the Kreuzberg end of the bridge. The rest of the team crosses, with one person secretly smuggling a small item. Customs gets 60 seconds and one question per person, then has to name the smuggler. Film the interrogation and the big reveal with the bridge towers in the background.