Not all eyes that notice bugs in Open Source code belong to saints who will report or repair them in the interest of the public good.
If McDonald's were run like a software company, one out of every hundred Big Macs would give you food poisoning, and the response would be, "We're sorry, here is a coupon for two more."
No matter how slick the demo is in rehearsal, when you do it in front of a live audience the probability of a flawless presentation is inversely proportional to the number of people watching, raised to the power of the amount of money involved.
Law 1: Every program can be optimised to be smaller. Law 2: There's always one more bug. Corollary: Every program can be reduced to a one-line bug.
The standard rule is, when you're in a hole, stop digging; that seems not to apply [to] software nowadays.
At the source of every error which is blamed on the computer you will find at least two human errors, including the error of blaming it on the computer.