When developing in Drupal, you probably have a couple of text editors open, you have a MySQL connection running, and you have a browser open. You are hard at work, and your brain is multi-tasking. You type in your information, and muscle memory to save it. How many times have you been in the browser and hit a keyboard shortcut to save?
The save box for your browser pops up and you stop, think, think again, and realize your mistake.