To autograph seekers, Mark Twain would return a typewritten message:

I hope I shall not offend you; I shall certainly say nothing with the intention to offend you. I must explain myself, however, and I will do it as kindly as I can. What you ask me to do I am asked to do as often as one half-dozen times a week. Three hundred letters a year! One’s impulse is to freely consent, but one’s time and necessary occupations will not permit it. There is no way but to decline in all cases, making no exceptions; and I wish to call your attention to a thing which has probably not occurred to you, and that is this: that no man takes pleasure in exercising his trade as a pastime. Writing is my trade, and I exercise it only when I am obliged to. You might make your request of a doctor, or a builder, or a sculptor, and there would be no impropriety in it, but if you asked either for a specimen of his trade, his handiwork, he would be justified in rising to a point of order. It would never be fair to ask a doctor for one of his corpses to remember him by.