When the plane unexpectedly erupted into a fireball, that multimillion-dollar research project was almost instantly canceled.

Erupting unexpectedly with drama, the piece requires and delivers a vital catharsis.

President Bush had not even been in office a week when a conflict unexpectedly erupted over a minor drainage problem on the two countries' 1,952-mile border.

They blow up what they take to be the main operations room, and then the entire compound unexpectedly erupts with gunfire and explosions.

And when something is under too much pressure for too long, it can erupt unexpectedly, sometimes with rather alarming results.

And then, the manager and his team suddenly and unexpectedly erupted.

In 1968 it erupted unexpectedly, destroying the small town of Tabacón.

The next day they are all killed when the volcano erupts unexpectedly.

Beneath the surface there remains a tension and disquiet that can erupt unexpectedly.

A catchnet erupted across the tube unexpectedly and we bounced into it.