Dice Bomb by Ronjo

<iframe width="315" height="560" src="https://www.youtube.com/embed/AsYmEiSJz3Y" title="Dice Bomb" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

While sealed in a see-through container one large die changes into eight mini dice.

You show a clear container and the lid all around. Place a regular sized single die inside and put the cap on. It can be seen all around. Give the box a gentle shake and the single die instantly transforms into eight smaller dice of different colors. Take off the lid and dump out the dice.
Easy and fun to do!