The snap can also produce sonoluminescence from the collapsing cavitation bubble. A balloon dangling from one nostril (a "snot bubble") indicates sleep. The impact can also produce sonoluminescence from the collapsing bubble. The bursting of the mining bubble was ruinous for Disraeli. It means there was a speculative bubble. Gifford appears at a parade hidden inside a bulletproof glass bubble. And I'm all out of bubble gum. This can then cause a speculative price "bubble" to develop. Eventually, this speculative bubble proved unsustainable. Any economic fallout from the bubble was very limited. Consider the difference between a carrot and chewed bubble gum. This leads to an effect that has been called a filter bubble. A similar separation happens with iridescent materials, such as a soap bubble. This exists in an equilibrium with chlorine gas, which can bubble out of solution. It is generally considered the first recorded speculative bubble.