Typically invoked by governmental officials during sworn testimony to the U.S. Congress to deny potentially damaging -- politically and/or criminally -- behavior.
From the 1994 film "Clear and Present Danger" starring Harrison Ford:
Jack Ryan: Who authorized this?
Robert Ritter: I'm sure they'll ask you that.
Jack Ryan: Who authorized it?
Robert Ritter: I have no recollection, Senator
A most highly effective statement one can use to quickly end an episode of unwanted texting with a platonic friend.
It seemed she was unable to stop what had become endless workplace texting and so I texted, “I have no pants on,” which brought it to a screeching halt for the rest of the afternoon.