NO RECALL NEEDED
A Newspaper reporter once asked Sam Rayburn, "Mr Speaker, you see probably a hundred people a day. You tell each one 'Yes' or 'No' or 'Maybe'. You are never seen taking notes on what you told them, but I have never heard of you forgetting anything you have promised them. What is your secret?"
Rayburn careful eyed his questioner and replied, "If you tell the truth the first time", replied, "you don't have to remember".
Extracted from "Speakers Handbook II", Glenn Van Ekeren, Prentice Hall, 1994