MBoX is a fun program which lets you create fake error messages in Windows and use them to surprise your friends or to crack a good joke with your fellow workers. Watch in amusement as they smash their computer to bits trying to figure out what´s going on.

The program allows you to personalize all the elements of the message window, including the title, the text, the buttons and the icons. You can determine when the error message will load (for example, when Windows first starts up).