1.   Doomsayers had been saying for some time that the housing bubble was going to burst.

2.   You know when you put soap in and the bubbles go?

3.   Do you think that this stock market bubble is going to burst?

4.   He is swishing around a Diet Coke bottle, trying to make the bubbles go away.

5.   Silicon Valley has been particularly prone to layoffs since the dot-com bubble went pop.