A client of mine called our helpdesk with a problem.
Client: I have a problem with my computer.
Helpdesk: What's happening exactly?
Client: The mouse isn't doing what it's supposed to be doing according to the manual.
Helpdesk: What does the manual say?
Client: The manual says when I move the mouse forward the arrow on the screen should move upwards.
Helpdesk: And the mouse is doing what exactly?
Client: It's moving down the screen when I move it forward.
Helpdesk: Downwards? As in down to the bottom of the screen?
Client: Yep, it's broken.
Helpdesk: You may find you are holding the mouse the wrong way around.