Answer: Kids playing the game of Poohsticks at a bridge located in Ashdown Forest, close to the village of Hartfield, East Sussex, England. This is considered to be the bridge on which A. A. Milne and his son Christopher Robin first played the game. (It is a game first mentioned as being played by Winnie-the-Pooh and friends in the book The House at Pooh Corner by A. A. Milne. Each participant drops a stick on the upstream side of the bridge; the player whose stick first appears on the other side is the winner.)
Cracked by Mouli, Zizzyphus and Sankhya.