I have this problem with ctrl. I have a habit of making capslock act as another control key. When I get to other systems I'm constantly fumbling and turning caps lock on and off. However, I think it's pretty obvious from the speed of my fingers that I know what I'm typing but I just seem to be hitting the wrong keys.

And of course, switching editors and operating systems can really confuse you. I can't count the number of times I've copied something, gone to insert it into the editor, and realized that the system I'm on doesn't automatically copy highlighted text.