If you want to play a small joke on your friends or anyone else who accesses your PC, use this program called Sakasa Mouse.It is a totally free application, very small in size, whose presence on your PC will be all but invisible. It works to reverse the direction of the mouse movements, driving the user crazy.Sakasa Mouse works like this: once the program is installed, if you move the mouse to the left, the cursor will move to the right. The same happens in the opposite direction, and also up and down.As you can imagine, laughs are guaranteed, especially if you are watching the poor person attempting to control your PC. Just go to the Sakasa Mouse icon to finish the program.