Cool Science Experiments for High School Kids?

Does anyone know of any cool science experiments for high school kids?

It needs to emphasize education, I must be able to explain it in 5-7 minutes, and I'd like something with cool and dramatic effects for fun.

 

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http://all-science-fair-projects.com/category0.html

a 1 min check makes me doubt because the experiments look rather hard

 

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two words: POTATOE GUN!!!!

Not only are they fun as hell to use, you could make a science fair project out of ballistic trajectories, maybe employ very basic calculus to predict how fast a projectile is exiting if it goes yay-far launched at yay-angle.

 

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liquid nitrogen ballon dipping

 

color change with chemical combinations

electricity from lemon...lightbulb experiment

 

One of my earlier memories was my science teacher setting up a device with 2 metre rulers and a load of elastic bands to clap together and make a large sound. Then sent one kid to the end of the playing field while the rest of us at the other end timed the difference between seeing the rulers snap together and hearing the sound.

Maybe you had to be there.

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oh this one is sweet. resonance pattern of elastic band...sigma waves...

 

also this is classic, hit a wall and it will hit back. Newton's law.

 

In case you didn't gather this would demonstrate how sound travels slower than light.