POP!

This was going to be the most awesome pic of the exploding baggie, exploding! but the dog walked in front of the camera right as it "popped" - really dog? you weren't invited to our science class today!
Baking soda, tbsp and a half, wrapped up in paper towel. half cup warm water, quarter cup white vinegar...drop in, seal quick, wait excitedly......POP! then clean up the mess with a large old towel ;0)

...oh yes, almost forgot, and then say, "can we do it again, can we do it again" at least a hundred times...maybe tomorrow kids :0)
actually the littlest one thinks it would be really cool to do it with a balloon instead of a baggie - yikes! that's an outside one I think.