This is a great prank for the Technicaly Challenged,they will not be able to figure out how to stop it. Make sure to do this on some one elses computer

Step 1: The Code

First open Notepad Then copy and paste this into it.
@echo off
color 2
:start
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%

echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%

echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%

echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%

echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%

echo %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random% %random%
GOTO :start

Step 2: Save It

Go into note pad and seclect save as then save as matrix.bat BUT change the box shown in picture to all files

Step 3: Almost Done

Now your code is ready you can run it and stop here if you just want to impress your friends
but continue for prank. first open your file then right click the border and click Properties. Then in the top right change window to full screen then hit ok then save properties for future window. then run the file and whtch hilarity ensue