Ahbutsurelookit! [coupled with gaze off into the distance and soft exhalation of breath.]
You know it; I know it; the man on the moon knows it, but I can’t change my position (because of _______*).
*Someone not present as we hold this conversation who would absolutely kill me if I were to alter my stance.
The phrase is commonly employed by the Irish male finding himself in an impossible situation by ‘the boss’, typically his wife or the guy who pays his wage. In the latter instance, the boss is probably an idiot and holds a faulty opinion; in the former, it is often an inconvenient but correct long-term stance (such as a trip to IKEA clashing with a last-minute call to join the lads in the pub).
Any other such phrases spring to your mind?