Oscar Madison: I can't take it any more Felix, I'm cracking up. Everything you do irritates me. And when you're not here, the things I know you're gonna do when you come in irritate me. You leave me little notes on my pillow. I told you 158 times I can't stand little notes on my pillow. 'We're all out of cornflakes. F.U.' Took me three hours to figure out F.U. was Felix Ungar!

Walter Matthau to Jack Lemon in the wonderful screen version of Neil Simon's 'The Odd Couple', 1968