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I have corrected every error that alert readers detected in the first edition as well as some mistakes that, alas, nobody noticed - and I have tried to avoid introducing new errors in the new material. However, I suppose some defects still remain, and I want to fix them as soon as possible. Therefore I will cheerfully pay $2.56 to the first finder of each technical, typographical, or historical error.
D. E. K.

As quoted above from the preface to The Art of Computer Programming, one stands a chance of getting a reward check from Donald Knuth, given the right MIX of alertness, luck, and circumstances in general.

Knuth was kind enough to send me one for chancing upon a discrepancy.

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