You have to go to the jungle and defeat Spat. The natives will give it to you. To defeat Spat you need to make a slingshot. Go up to where the wedding is and turn left. there will be 2 houses, in one of them is the pushy sales man. Buy the rubber band. Then go to the swamp where Spat is. Go to the sandy spot and Heyhoo. He will throw a stick at you. Get the stick and go to the inventor's house. Ask him to make a slingshot. When he's done go back to the swamp and select Hamscope(I think that's the Hamchat) AIM FOR THE BEEHIVE. He then loses the marble. Take it back to the natives and then after the couple marries, the old geezer will give it to you.