Faecal variation of the old children's game of dropping sticks off a bridge and seeing who's stick floats under the bridge first. The added skill is being able to produce a suitable turd more quickly than your opponent and without falling backwards into the river (potentially hitting one's own turd to add insult to injury)
When Pooh arrived to the bridge spanning from one side of the creek to the other, he saw two figures standing on the bridge, intensively staring down into the water. One was Piglet. And the other one looked very much Eeyore. Amazingly much like Eeyore. If Pooh hadn't been so sure that it couldn't be Eeyore, he might even have believed that it really was Eeyore.