The Egg and Eye

For my experiment I want to make a rubber like bouncy ball with the egg.  I would just need the egg and some vinegar.  I put the egg in the vinegar and let it sit for a day.  During that time the vinegar reacted with the calcium in the egg shell to create a bouncy membrane.  The egg bounced for awhile until it fell too hard and busted and the yolk and other insides spilled everywhere.  Perhaps if you boiled the egg it will be less likely that the egg will bust.