This happened to a friend who works as suport on a mobile phone company.
The client, some kind of farmer guy, who kne nothing about cell phones, neded help to program his phone, my friend tried to explain to him everything step by step, and even had to start over like 3 or 4 times. During the las try, something happened:
Client: Uh? Now my phone has started to blink and its moving by itself.. what does it means?
My Friend: (tired from a way long and stupid call) Sir, your phone its going to explode!!!
Client: Im going to die!!!! (My freind then heard the sound of the phone being trown to the floor, and then it was all silence)
Of course, my friend got an amonestation, but what the hell, it was fun.