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On October 14, 2011, Carsten Morar-Haffke, Martin Paas and Charlie Kaiser were interviewed by Anna Planken and Sven Lorig about how the characters work and talked a little about the upcoming Sesamstrasse segment Ernie & Bert Songs. Among the questions was "How do Bert eyebrows work?" Carsten Morar-Haffke said that inside the head there's a ring in the mouth that are attached to a small mechanism, but he has no idea how that works. He operates the ring with his middle finger to make the eyebrow move.