This hack will allow You to become "unknown" race, in other words You will start with sheep.
These sheeps can't attack or build structures so You will lose game.
But Your enemy will be confused :P
To use this hack run regedit
HKCU\Software\Blizzard Entertainment\Warcraft III\Gameplay
Change ammrace to "10" (hex).
to turn of just change ammrace to "20" (hex).
Or download this tool, it will do editing for You.
This hack will not work with latest 1.24e Wc3 patch