The answer is the release of millions of little rubber worms! It's fascinating to watch. But honestly, this video inspires far more questions than it answers:
1. How did he not cut his thumb off?
2. Why is he wearing the protective glove on the wrong hand?
3. Why did not show us the film from the beginning of the cutting?
4. Where is this ball from?
5. How old is it?
6. Why is he cutting it?