Employees also can download thousands of programs on their own, which can be a security nightmare for a corporate network and cause compatibility issues when the company wants to update operating systems and apps.

WSJ: Company's Most Common Tablet Mistakes

Anxious casino executives were pleading with Higgins to help fend off the rolling blackouts that were hitting California: A dark half-hour on the Strip could mean tens of millions of gaming dollars lost, not to mention a security nightmare.

FORBES: Magazine Article

The data breach that occurred at Fidelity National Information Services last week was a security professional's nightmare.

FORBES: Magazine Article

Nuclear weapons can be a costly nightmare of military command, control and security.

CENTERFORSECURITYPOLICY: Center For Security Policy

At airport security, you pull your laptop out if its bag, and (nightmare of nightmares) you drop it by mistake, cracking the screen and ruining the hard drive.

BBC: The business travel benefits of cloud computing