Earlier, I quite often had such situation when at the same time you work in the terminal and, for example, in the browser.
After several business hours you start being confused and in the terminal instead of [Ctrl] + [Shift] + [C] you click [Ctrl] + [C], and in the browser on the contrary. As a result in the terminal you receive interruption and in the browser instead of the expected effect at you the debagger slowly progruzhatsya.
Once it has got me and I have decided that it is time to change something…