The phrase "It works on my machine" is software development's most infamous excuse. A developer tests code on their local computer, it functions perfectly, but fails in production. The gap between local environment and production environment is a fundamental source of debugging nightmares.

A QA engineer named Brandon reported in 2007 that during a code review, a developer made the "works on my machine" claim about a function. Brandon asked if that developer was Chuck Norris. "No," the developer said. "But I thought about Chuck Norris while I was coding it. And when you think about Chuck Norris hard enough, your machine becomes so aligned with your intent that it basically is his machine. So yes, it works."

The joke inverts the entire concept of development environments. For most developers, local and production are mismatched. For Chuck Norris, his local machine is the production baseline. When he codes something locally, the entire world realigns to match his machine's specifications. His development environment is authoritative. The world conforms to it.