Prank Your friends : Make friends scare from VIRUS

Open notepad and type this:

lol=msgbox ("Warning a virus has been detected on your PC. Press YES to format your hard disk now or press NO to format your hard disk after system reboot",20,"Warning")

Then save it as Virus.VBS

and go to the folder that contains it and open it if a window pops out saying a virus has been detected it's working. Press yes or no to close the window and put it in the startup folder of the victim's account.
On startup the window should appear.

Note: This does not harm your computer as it does not contain virus.

The Yes and no button does not do anything except closing the window.
And you can edit or change the name of file, just the extension .VBS is important.
Also you can change the message, like lol=msgbox ("Type your message here")
And yes,In between make sure your victim does not panic and really reformat his hard disk. lol. enjoy