Well, I was bored. So yeah 
Basically, it inverts the mouse movements.
PHP Code:
// By Mayazcherquoi/Dan's The Man.
// - Run the script by the run button to run.
// - Either manage to press the stop button or press F3 to stop the script.
// - Enjoy!
program OppositeMouse;
var
cdX, cdY: Integer;
X, Y, sX, sY: Integer;
begin
SetDesktopAsClient;
GetClientDimensions(cdX, cdY);
repeat
GetMousePos(X, Y);
Sleep(1);
GetMousePos(sX, sY);
X := X + ((sX - X) * -1);
Y := Y + ((sY - Y) * -1);
if(X < 1) then
X := 1 else
if(X >= cdX - 1) then
X := cdX - 2;
if(Y < 1) then
Y := 1 else
if(Y >= cdY - 1) then
Y := cdY - 2;
MoveMouse(X, Y);
Until(IsKeyDown(VK_F3));
end.
Enjoy! Cos' it only took a couple of seconds to make :/