Exploding things
For various teaching purposes I have been able to explode some things. This is not only fun and educational, it also makes some really good high speed videos.
Exploding Gun Cotton for a Christmas Lecture
Hydrogen/Oxygen "rocket" lit by hand
2016 version
2016 Flash
The same rocket lit by an electric spark
Carbon Dioxide
Flash Powder
Acetylene/Oxygen
Cola/Mentos Fountain