You may have never thought about it before, but computers are great tools to play pranks on people. Take a look at Message Box Toy and you'll see how.
Message Box Toy is a fake Windows message generator with which you can create your very own Windows messages and schedule them to appear on your victim's screen.
Message Box Toy includes all the characteristic elements of an error message: title, icon, text and a couple of buttons. You can freely customize all of them and add your own question, error message or warning divided into four different lines. As for the icon, you can choose between "Stop", "Exclamation", "Question" and "Information" icons.
The program saves then the error message as a TXT file, and here comes Message Box Toy's main drawback. There's no built-in scheduling system, so you'll need to use Windows Scheduled Tasks functionality – or some other third-party tool to schedule actions – if you want the messages to appear automatically.
With Message Box Toy you can create hilarious fake Windows messages, though you'll need another external tool to schedule them.