Knuth no longer sends out real checks, but now sends out what look just like checks, written on his pseudo Bank of San Serriffe (pun on sans serif font). There

Knuth no longer sends out real checks, but now sends out what look just like checks, written on his pseudo Bank of San Serriffe (pun on sans serif font). There's a picture of the one I received at http://www.arcfn.com/2011/05/my-knuth-reward-check.html http://www.arcfn.com/2011/05/my-knuth-reward-check.html - the amount is in hex: 0x$1.00 The parent article describing in detail how to find an error seems like overkill - my strategy was "I was on vacation and I looked really hard for an error".