In this video they have a CH-47 helicopter strapped down to the pavement and they conduct a resonance test on it. This consists of running the blades up to a pretty high speed. There isn't any information in the caption on why they are running the test but some of the comments on the video suggest it is because they were having problems where the helicopter would invert midflight. Once this thing gets up to speed in the video it starts smoking and finally the whole tale rotor section piece there just rips loose from the rest of the helicopter and sags to the ground. Oops.
Here's a pretty crazy resonance video I found over on a video site. You maybe have seen some of our other blogs where they use resonance to form patterns in sand and water. In this video which is similar a guy has about a 30cm diameter piece of paper covered in moss spores. The paper is vibrated and it causes all kinds of crazy patterns to form in the spores (powder). The different frequencies cause different patterns to form. He focuses on two patterns in the video where the spores spin around like a galaxy in the center of the paper; first clockwise and then counterclockwise.
Apparently in this video there is some kind of speaker hooked up to this black platform. On top of the platform is a bunch of white rice. The speaker starts at a low pitch whining sound and each different change in pitch of the whine causes the black platform to resonate at a difference frequency (or at least that is my guess as to what is going on). The different resonance causes the rice to form different patterns on top of the black platform. This reminds me of the video of the corn starch being vibrated at a high frequency.