Joshua Batson and I made some educational videos on physics topics as part of the MIT + K12 Initiative. In them, we play brass instruments in tuxedos and look at the waveforms, demonstrate the Doppler effect by playing a trumpet out of a moving car, and investigate the Poisson spot by shining a laser at a ball bearing.

How do we hear sound? License: Creative Commons BY-NC-SA More information at http://k12videos.mit.edu/terms-conditions
Understanding the Doppler Effect (or, why does that siren sound so funny?) You hear an ambulance outside, siren blaring. It approaches and passes by -- and you notice an obvious change in pitch. What is going on here? Let's use physics to find out!
The wave theory of light predicts that there should be a bright spot right in the center of the shadow of a spherical object. This sounds crazy...but is it true?