Playing Poohsticks

Pooh had just come to the bridge; and not looking where he was going, he tripped over something, and the fir-cone jerked out of his paw into the river. 'Bother,' said Pooh, as it floated slowly under the bridge, and he went back to get another fir-cone which had a rhyme to it. But then he thought that he would just look at the river instead, because it was a peaceful sort of day, so he lay down and looked at it, and it slipped slowly away beneath him, and suddenly, there was his fir-cone slipping away too.
'That's funny,' said Pooh. 'I dropped it on the other side,' said Pooh, 'and it came out on this side! I wonder if it would do it again?' And he went back for some more fir-cones. It did. It kept on doing it...
And that was the beginning of the game called Poohsticks, which Pooh invented, and which he and his friends used to play on the edge of the Forest. But they played with sticks instead of fir-cones, because they were easier to mark.' (From The House at Pooh Corner) by A.A. Milne.