The kids here find these spiders around the place. Then they set pairs of spiders to fight along a piece of silhig (that piece of the centre of a coconut leaf, that are normally used to make brooms here).
This is a huge thing amongst the local children (who haven't got many shop-bought toys, so they have to use their imagination in ways that spoiled Western brats could never do).
They keep their champions jealously, in empty match boxes, and even trade them amongst their friends. One good spider can be worth seven pieces of candy.
Then I think back to my own youth; we used to have conkers (horse-chestnuts) that we collected in the local woods. You strung the conker and slung it against your opponent's. If that broke, you won.