It is that time of year, you will start seeing conkers out. They are horse chestnuts but as with many things there is a history with these oval nuts you will see due to autumn arriving.
Children used to play a game with the conkers by drilling a hole in them and putting a string through the conker. The game is played between two people and each person takes turns to hit the other person's conker trying to crack it. Who ever cracks the others conker wins!
Now schools have discouraged children playing this game and even provided safety goggles if they do allow it.
There is even a World's Conker Championship in Northamptonshire.
Here is a great website for more information.