And you can use them to organise a Conkers Tournament during lunch time at work.
That's what we did yesterday.
When I was working in Sweden last year there were lots of Horse Chestnut trees on site, so I tried to organize a UK v The Rest of the World Conkers Tournament ( there were Swedes, Finns, Norwegians, Belgians, French, Germans, Czechs, Croations, Bosnians, Spaniards, US Citizens and Canadians working there ). In the end, it turned out to be an Anglo Irish - English - Welsh - Scottish tournament, as the rest of the world couldn't see the point of it.
Their loss.