Pressure - Wine Bottle and Cork

 

In this demo, you add a pair of gas-producing ingredients to the bottle (e.g. baking soda and vinegar, coke and menthos, beans and Mexican food, etc.), put the cork on, and aim the bottle at someone you particularly dislike. The chemical reactions release gasses, which build up pressure under the cork until it is sufficient to pop the cork.

Not pictured but necessary: a gas-producing pair of ingredients.