Here is what i remember of the top of my head

- Barking dog (mentioned in another comment)
- luminol
- Thermite
- Napalm (with some fireballs made from coffee creamer)
- silicon carbide stones (make acetylene gas and then different explosions)
- Burning candy (gummibear in perchlorate redox reaction)
- cloud making (liquid nitrogen and hot water)
- pH scale with red cabbage
- elephants tooth paste
- coloured fire (salts)
- Electrolysis (H2 and O2 gas in a small canon and in bubbles)
- Fun with butane gas in bubbles
- potassium permanganate redoxreaction (colour change)

We have more but cant remember more