My old boss had a few;
My fault your error.
Watching that boy work reminds me of watching a monkey **** a football!
And his all time, most used was TRUST ME !
The government's motto: "If it ain't broke, fix it 'til it is".
And the one which comes to mind every time I see or hear Obama: "Treason doth never prosper. What's the reason? For if it prosper, none dare call it treason".