(With All Due Respect )
The 'GRAND MOTHER' (not to be confused w/ "Grandmother") of all "DISCLAIMERS" in the genre of 'Polite Speaking'..
Maintaing your status as a 'gentleman' (/woman) whilst still taking the time to correct a speaker (or commenter) on their "incorrectness" regarding a matter.
Something you say before (as a gesture of kindness) you make someone else look like a total jackass for speaking on something THEY don't fully-undetstand.
Something you say to the cops right before you refuse their request.
A quick 'pardon' in the pursuit of correct information being circulated on the internet.
W. A. D. R. "With All Due Respect" Officer, I'm NOT GOING TO ANSWER ANY QUESTIONS."