The winner is a staple of all authentic Anglican Machiavellianism. It is:

The Listening Process.

The winning phrase combines all the necessary qualities:

• It beguiles the naïve into taking it at face value; really, no-one is listening because they are either asleep or talking.
• It is more disingenuous than Fred Hiltz’s smile.
• Its potential to stun is rivalled only by a taser.
• After half an hour it causes a nose-bleed.
• Like any phrase ending in “process” it is designed to prevent the previous word of the phrase occurring.