I have seen the games on LA streets. Fantastic stuff. People who do not have enough money slap down $100 bills on table and put their hand quickly on the shells and turn them over to see they have lost their money. They go into shock they were so sure.
This is all as the gamer is walking down the street with a cardboard table on his belt, and keep his eyes out on the cops. Their earthly street skills are fantastic. It would be a scary way to make a living. I will tell you seeing it on the street and for entertainment are two different things. Street people would fall flat doing it for entertainment, but are fantastic on the street. We are not talking something that hits the gut in impact. Oh and a magic enterainer doing this would not be long lived on those street.