[quarterto]

And off-by-one errors.

[46Bit]

Off-by-one errors only affect good programmers. Otherwise you just add enough of such errors that all the under- and over-summing cancels out.

7 years ago, when I was a new programmer, I did use a technique like that to fix some JavaScript. I feel brave confessing that.

[evolve2k]

Just I case FYI: the off by one errors is part of the joke of the statement.

[valentinu]

The reference: http://martinfowler.com/bliki/TwoHardThings.html