I used to work as a PC salesman at a large home electronics retail store. The credit for this sadly true story goes to one of our techs.
A lady comes over to the tech bench one day with her cpu tower in her arms. She sets it down on the counter less than delicately and declares that she bought it 6 months ago and now it isn't working. So the tech plugs it in to check it out. Sure enough, it's all hooked up but it won't switch on.
Next the tech decides to pop the case open to take a peek inside. He gets the side panel off and is greeted with the strong smell of household air freshener. He asks the lady what the smell is.
She explains that she didn't like the smell coming from the fan at the back of the PC so she sprayed air freshener inside it.
The tech is dumbfounded. He stutters for a few moments and then finally manages to choke out, "You can't spray aerosol AIR FRESHENER *INSIDE* your computer!!"
The lady looks confused for a moment, then snaps her fingers. Her enthusiastic reply is, and I quote: "Oh, I should've used *LYSOL*, right??"
The tech, all red in the face, had to leave for 5 minutes and when he came back he simply closed the case back up, handed it to the lady and told her that the PC was dead and that she should NOT try looking for a new one.