A small bubble of blood appeared in his chest and popped.

The bubble popped when the younger man looked up at me and said, "I'll be with you in a moment."

When Keller opened his eyes, all he saw was bubbles popping.

When the first bubble pops, keep cooking and stirring for another minute - even two.

A bubble does not pop until months or years after the funding ceases.

When (and if) the bubble pops, voters will get involved with a vengeance.

Then, as though a bubble had popped, the moment of disassociation was gone and it all came back to me.

Here's the approach I would take: Why do bubbles ever pop?

When he tried breathing through his nose, huge bubbles of blood expanded and popped.

When the wall gets thin enough the colors will appear to disappear, just before the bubble pops.