I have been accosted once with the string bracelet scam in Paris at Sacre Coeur, two guys at once that one time, I was alone. They didn't have the height and I was without luggage (a big difference) except the fanny/waist belt. True, at the initial moment I was caught off guard but they left frustrated.
One could very well run into the "thimble" game or shuffling three cups around, whatever you call it. I stood and watched it the last time in Paris, same area. Anyone with an ounce of brain can figure out it's rigged. I did see guys playing and lost. A 50 Euro bill (that would not pay a parking ticket in SF) was taken from them. Women I saw pointed out the correct cup and won. These women were plants, ie, part of the rigged game. The guys losing 50 Euro I thought were plants too. Difficult not to notice that these "winning" women were always of the same ethnic group as the guys carrying on the game, trying to entice hapless tourists.
True, these sort scams don't take place in Germany. In the past , yes, the thimble scam game on Kurfürstendamm in 1989 and '92 when I was there, right on the broad sidewalk. I also saw signs on Kurfüstendamm written in German and English warning people not to participate in this organised crime activity from Romania. When I went back in 1995 to Berlin, it was gone.