You can disturb your friend by this simple notepad trick.
By this trick you can show messages continously on your friend's
cmd screen.
Just open notepad and type the code bellow............
@ECHO off
:Begin
msg * Hai
msg * How are you dear….
msg * I am fine ya!
msg * Lets have fun together!
msg * Because you have been o-w-n-e-d
GOTO BEGIN
and save it as "anyname.bat". Now when your friend click the file then
it happens.