Step 1: Assemble the troops!

Get yourself some Baking soda, Vinegar, and a cup/bowl. Paper towels would also be a good idea in the case that your evil experiment flows overboard.

Step 2: Commence!

Picture of Commence!
Pour the Baking soda in first (Amount depending on how big you want the reaction), Then, saturate it with Vinegar!


Step 3: Aftermath.

Yes; I realize this is a 3-step instructable. But it's my first. To explain what is happening: The Baking soda is reacting with the vinegar and creates CO2 gases, like the kind we exhale and that cars produce. This is also what causes the fizzy taste in Cola and other sodas. The Baking soda will be mushy, rinse out your container good so no one drinks slime. There are other experiments; one blows up a baloon, another blows up bottles. The latter isn't  recommended for anyone under 14 or without any common sense. Enjoy.