From Chapter 5 (Debugging: http://cm.bell-labs.com/cm/cs/tpop/debugging.html ) of The Practice of Programming by Brian W. Kernighan and Rob Pike

Explain your code to someone else.

Another effective technique is to explain your code to someone else. This will often cause you to explain the bug to yourself. Sometimes it takes no more than a few sentences, followed by an embarrassed "Never mind, I see what's wrong. Sorry to bother you." This works remarkably well; you can even use non-programmers as listeners. One university computer center kept a teddy bear near the help desk. Students with mysterious bugs were required to explain them to the bear before they could speak to a human counselor.

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