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What are the signs of a bubble about to burst, such as the housing market in San Francisco or tech bubble?

Abbreviated Question: 
What are the signs of a bubble about to burst, such as the housing market in San Francisco or tech bubble?
Answer: 

It’s logically impossible to predict the bursting of a bubble. If it were possible, everyone would sell before the bubble burst. The selling would cause the bubble to burst earlier. But then people would anticipate the earlier bursting and sell earlier. And so on. Finally we would reach the beginning of the bubble, where our logic implies that no-one would buy: there would be no bubble.

So for bubbles to exist, their end must be unpredictable.