Guys i just made a fake virus (a prank)
open notepad and type this:
@echo off
echo your computer is hacked hahaha
-s -t *type how many seconds you want* -c "put you message here"
and save the file as .bat on desktop
Then right click on desktop and New->Shrotcut
then browse the location (thats desktop) than put the name of the shrotcut and finish.
Then click on the icon you made and Properties->change icon ... then choose it
and click OK.
After that when your friend or parent click on the icon the message will appear and the computer will shutdown in seconds you choosed.
enjoy the prank