What are some cool dry ice experements suitable for a highschool chemistry project?

I am doing a video project for school and I need either some actual scientific uses of dry ice or a cool experiment using dry ice. Can anyone help?|||You can stick a quarter (or another small object) inside the dry ice, and what happens is small pockets of gas are formed around the quarter that make it flap around side to side. Another cool idea is to put bubble soap and some water together and then put the dry ice in. It will cause the bubbles to almost solidify. That should be easy enough...and you'll probably get a A+ too!