Those of you with memories like elephants may recall the case of the Microsoft Knowledge Base Article which contained the following classic:

A Connection Manager Connection Does Not Connect After Being Disconnected

There was a rumour going around back then in 2003 that Microsoft had planted such error messages to subjugate humanity to its dark will by means of provoking a logic feedback loop synaptic collapse. Well, the black helicopter brigade may have been right, because here's a warning from Vista:

We think we know what it means, but, no, hold on a minute... can't... think... must shut down computer before it's too... ®

Bootnote

Thanks to David Hough for the tip-off. David is said to be "steadily recovering" from exposure to the Vista brain bomb after doctors prescribed a healthy dose of Linux.