Hospital CT scanner. That's some fast computed tomography!
Subsonic sound waves (not "shock" waves) become visible. Guess the wavelength and
figure out the frequency?
Oops. Don't mix oxy with your H2, instead just add a bit of air.
What *is* 'lycopodium' powder anyway? Ask Mr. Wizard?
Build a tornado box
Vortex ring launched from LARGE HUGE BIG cardboard box
Melt some metal at room temperature.
Not Lake Nyos. Dangerous carbon dioxide pools
NOT A CGI EFFECT! But not a true sonic boom either. The Atlas missle was
just below mach-1, so the visible cirrus-cloud ripples are sphere-waves of
engine noise produced below and following the vehicle upwards.
Popsicle stick explosion
Tesla Coil lightning discharge will follow a laminar argon gas flow.
Yes, it's a Death Ray.