The easiest way to get any suspicious windows off your screen (and fast!) is to go straight to the desktop. On Windows PCs, the shortcut is "Windows Key" + D. On a Mac running OS X, just press the F11 key. Now, the only drawback here is that your boss might be wondering why you're just sitting there staring at your desktop. Pretend you're looking for a folder, or pick up the phone and start randomly dialing.