Anyone who uses Windows in full screen mode in Lion or Mountain Lion knows that if they try to close a maximized program they will accidentally click the top of the screen which brings down the Mac menu bar. Then when you click you select the two diagonal arrows for lion full screen which drops you into a windowed VM. This happens all day long and it's so obnoxious. I know I could turn on the old school hot corners, but if I do that then I cannot easily swipe between Windows and OS X with 3 or 4 finger gestures. I like Parallels better but at least VMware Fusion has implemented a delay. It doesn't have to be long, 5-10 seconds of the mouse at the top of the screen before the menu bar drops down would solve this major problem. This is not a difficult issue to fix.