How do you make a egg bounce in vinegar?

How do you make a egg bounce in vinegar?
Here's what you do:
Fill the jar with the vinegar (enough to cover the egg) and place the hard-boiled egg inside of the jar. Put the lid on the jar and loosely tighten it. Leave the jar in a place where it will not be disturbed; especially away from the little brother's hands. You'll notice that many small bubbles will form on the eggshell as soon as you place the egg in the vinegar. If you watch the egg for a while, you'll see that some of the bubbles will grow larger and rise to the surface of the vinegar. Sometimes, large bubbles will form on the bottom of the egg. The egg will move around because the egg and the vinegar are denser, or heavier, than the bubbles. The egg will float as soon as enough bubbles are attached to it. The bubbles will cause it to move so that it looks like it's alive!The vinegar will completely decompose the shell of the egg in about one or two days. When the shell is gone, take the egg out of the jar and wash it and allow it to dry. It will feel leathery. After it's dry,try to bounce it. It will bounce like a ball!