Disgruntled employee plants a logic bomb on their ex-employers machines before quitting.

A certain former employer of mine that provided outsourced security management services (who will remain nameless) had me plant a logic bomb on one of their customer's firewalls at one point. They were concerned about non-payment.

In retrospect I should have refused. Interestingly enough the proprietors of that business seem to have problems with my integrity. [snort!]