"Heading towards the Autobahn I noticed I was being followed by a very tall, very nervous, African immigrant. I stopped, he stopped and looked nervously around. I went on and he followed me, still looking nervously around. Finally I went into a phone booth, picked up the phone and started talking loudly in German as if my friends were coming to get me. The African disappeared into the darkness. The coast clear, with relief, I headed for the Autobahn.
Good, quick thinking.