Or just do this at home(we did at work). No need to ruin a speaker.
1) Mix cornstarch with water in shallow plastic bowl.
2) Hold the bowl firmly against an office-grade subwoofer
3) Turn bass+volume to max
4) Start experimenting with music (or noise generators of different frequencies)
We had about 10 minutes of similar effects before the headache hit.
At first, I thought it was some kind of ferrofluid — those tend to behave rather similarly — but this is just corn starch, which behaves strangely when agitated like that.
1) Mix cornstarch with water in shallow plastic bowl. 2) Hold the bowl firmly against an office-grade subwoofer 3) Turn bass+volume to max 4) Start experimenting with music (or noise generators of different frequencies)
We had about 10 minutes of similar effects before the headache hit.