Here I am going to tell you how you can play pranks with your friend. This progrom is an infinite loop program which opens message box again and again. Victim feels that this is a virus.
@echo off
msg *Hi I am mr. virus.
: fool
msg * Formatting your hard disk.
msg * wait…..
msg * Never mind about me....
msg * Wants to stop me?
msg * I am caring for you.....
msg * start counting from 1 to 5,
msg * 1
msg * 2
msg * 3
msg * 4
msg * 5
msg * I am back!
Goto fool
Solution to this is restart your computer.