There's a street game. Basically, there a pool table; on the table is a black circle and within the black circle is a snooker ball. On top of that ball is a coin. The idea is to hit the snooker ball with a cue ball so that both the ball and the coin end up outside of the circle. Sounds easy? Try it.
It took me two attempts to do it. My rewards - I got to sign the stall's flag and also won a doll (Pingu) for my efforts, which I promptly gave to my Taiwanese assistant.