1st April is near so I though to publish this. I used to make these when I was about 10. It wont use any softwares and it doesn't need any programming skills. So, let's get started

Step 1: Making It

To get started, open notepad and copy in the following code:

x=msgbox("message",4+16,"title")

You can use your own message and title of the error

After copying this, save it as a 'vbs' file

When you open the vbs file, you will get an error message.

Step 2: Modifying the Error

There are many type of errors.
Some have only 'OK' button, some have 'Yes' and 'No' buttons
You can make any type of error you want.
To change the type of error, you can modify the numbers of the code(which were '4+16' in the last step)

Here is a list of the feature of the first number (no. before the '+' sign):

0- ok button only
1-ok and cancel
2-abort retry and ignore
3- yes,no and cancel
4- yes and no
5- retry and cancel

Here is a list of the feature of the second number (no. after the '+' sign):

16-critical message
32-question message
48-warning message
64-info message

Step 3: Examples

Here are some examples

Step 4: Masking the Error/Preparing the Error for a Prank

To mask the error as an app or a game, simply copy the vbs file some where (except the desktop) and make a shortcut of the file on the desktop. Then change the name to.......let's say FIFA 10 and use a similar icon. When someone opens the game, they will get an error saying that they are a big douchebag :-p

Vote if you liked it :)