He was called "The Master of Malaprop", which is where you purposely use the wrong word in a sentence, making it hilarious. For example, saying "You could have knocked me over with a fender." We assume the word "hilarious" meant something different back in the 60's.
You know that wherever he's going, George Burns'll be there waiting for him, and when Matthau knocks, Burns will point his finger in the air and say, "Enter!"
(d) July 1st, 2000