So the customer called the local team, and the local team conferenced in the outside support (my colleague) to help trouble shoot things and figure out what the heck was going on.
Naturally IT wasn't happy he'd let things go this long, but far as anyone could tell, it wasn't malicious. Now things had escalated, and the computer was being shut off by the mouse. At first, it wasn't happening often enough to be a problem, so he just lived with the issue. The local team checked it out, and found it worked fine on their test computer, and the problem didn't replicate itself while the local team was on site, so they just chalked it up to a user error. This fixed the issue for a few months, before it started cropping up again. At first, the client thought their mouse was bad, and got it replaced with another wired mouse. The tech went through the usual procedure, with the client noting that this had been happening off and on for the past year or so, and had only recently gotten worse. When it wasn't doing that, the pointer would just randomly twitch. The mouse would, from time to time, at seemingly random times, make a move on its own and click on something on the guy's desktop, or even click and hit "sleep" on the start menu, causing the guy's computer to shut itself down. The customer noted that he believed that there was a virus of some type on his computer, and it was affecting his mouse. He had just taken a call from a customer in the company we serviced. Fighting back laughter, he told the tale of the Ghost Mouse. Typically, when someone stood up in the cube farm, it meant they had one of those "you won't believe this" kinds of calls.
Some years ago, while working in a cube farm for a call center type tech support company, one of my colleagues hangs up his phone and stands up in his cube.