You may have been using Linux too much when...
Here are a few basic signs that it might be time to go outside for some fresh air.
* You become very, very confused when pressing the "tab" key does not fill in the rest of what you were typing.
* The phrase "man mount" does not strike you as particularly odd.
* When on your Windows partition you want to play a game, so you open up a command prompt and start typing "wine C:\Pro..."
* You are surprised at the blank look your boss gives you when you attempt to tell him, "sudo give me a raise".