Perils of Low Frequencies

[Cycho]

If the customer's beer starts doing this you may be in a lot of trouble:

 

[bassulele]

mind blown

 

[Bassamatic]

Interesting effect. Of course, you can only see this in a video, since he is syncing the speaker vibration to the scan frequency of the camera, producing a stop-motion effect.

Also - I thought that the sound was vibrating the water column, but is is only vibrating the hose end, if you watch carefully.

Still cool!!