Now that everything's networked and process control systems are easy to hack, here's a quick-reference guide to figuring out who's behind each type of security incident.

EFFECT

CAUSE

The Thames Barrier lets London flood

China

All bank vaults in the UK open simultaneously

Mafia

Your car starts broadcasting your emails and voice mails at random intervals

Anonymous

Local automated movie rental service only dispenses porn

Malicious computer science students

Toilets in school flush continuously

Bored school kids/disgruntled staff

Wii controller can be used to make your fridge dispense lemonade ice cubes

Your children

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