My inside voice

"Yes, I clicked on the logout button. I'm sure I want to log out."

"No, I will not take $375 sight unseen for my $500 item just because you spent all that energy sending me an email in response to my craigslist ad."

"No, you cannot use my photograph on your web page for your show, which you are charging tickets for, without asking my permission."

"Your logic is impeccable but the problem is here; your first assumption was that 1 + 1 = 3."

"Why yes, I'd love you send me a phony cashiers check for the motorcycle I have for sale. I'd like nothing more than to waste as much of your time as possible so you don't hook some unsuspecting loon into your false shipping scheme."