Convincing my wife that I really do NEED "another joystick", "another spinner", and "another trackball".
She wasn't too thrilled about me getting most of them the first time around, and can't grasp the nuances of how the controllers differ from each other.
To her a stick's a stick, a trackball's a ball, and a spinner is a knob that twirls around.
One is as good as the next, and should work for EVERYTHING, as far as she's concerned.