The boss called me into his office the other day for an IT problem. He's pretty tech-savvy so this doesn't happen very often.
"Take a look at this Andy," he said, "I can't work out what the hell's going wrong with this screen.."
His workstation is a laptop with a couple of large screens plugged in. He also uses an external keyboard and mouse. The man was trying to type a password into a web page but the insertion point cursor was whizzing along from left to right, apparently under its own volition.
"I've never had this happen before, think I should reboot..?"
Having absorbed some of my previous fixes, he was on the mark for a possible quick-and-easy fix by restarting the system. However on this occasion the fix was even quicker and easier!
I'd seen a similar phenomena before and the clue was he was using a laptop rather than a PC.
I glanced down, "Looks like you've got your mobile phone sitting on top of the mouse cursor pad..!"
Being the sensitive bloke that he is, I knew he'd be somewhat embarrassed at the 'obvious' gaff so I didn't hassle him too much. I think it was possibly the quickest fix of my career..