Even worse, in my opinion, is when you're typing away and a dialog from some other application suddenly decides to pop up and swallow all your key strokes; or,

Even worse, in my opinion, is when you're typing away and a dialog from some other application suddenly decides to pop up and swallow all your key strokes; or, in the worst case, one of your key strokes just happens to coincide with a shortcut key on the intruding dialog so you accidentally accept something without having a clue what the dialog was and what you accidentally accepted. OS should prevent any dialog from a background application from coming to the foreground of it detected that use is in the process of typing. It's not that difficult of a task after all. [Edit: auto-incorrected text]