It has glass balls in it, which are abrasive! It attacks all forms of rubber, It causes pitting in certain types of brass, It leaves behind a greasy film which attacks dirt, It causes the carbon on carbon track potentiometers to "turn to mush", It attacks plastic and damages it forever, Is IS safe for metal, wood, rubber, and plastic, Can't use in on bicycle tires, it will weaken the tube, It will mess everything up, Do NOT use it .. on anything you care about, Using it will also attract dirt, Do not use it as that is a lubricant, It is petrol based, YOU MUST NEVER USE IT ON MODEL RAILWAYS, It has a tendancy (sic) to soften plastic over prolonged use, It will losen (sic) screw (sic) etc, It displaces the grease in the chain's O- or X-rings, It is a wax based insulator, It is a petroleum distillate, It's magic ... is due to its main ingredient, DMSO, Knowledgeable people do NOT use it, It has micro beads of glass that are an abrasive, DO NOT use it! It is petroleum based. Use some KY, It can erode the rubber in the hop up, I'd omit it, It is not a good lubricant, protectant, etc, Do not use it. I don't remember why, It causes grief with gumming up knives, It is too thin and will actually accelerate bearing wear, DO NOT use it ever!, Do Not Use it on airbrushes, It can in fact even diminish existing lubricants, It may be flammable when a tea light is added... DO NOT USE it on your animal unless you want to kill it, It can gum things up, DO NOT use it, or anything like it!, It leaves behind a film that actually collects dirt and dust, Do NOT use it on the piano, It may seem to help at first... ...but you will soon notice the drawbacks, DO NOT USE it or similar cleaning fluid due to fire risk, The viscosity of it is all wrong, It is an abrasive spray, It will do more damage to the fan, It will cause a deterioration of the synthetic material, It may attack the lacquer finish and tarnish the brass, It magically manages to make the situation worse somehow, It can corrode the rubber bumpers at the side of the playing surface, It will actually ruin the Teflon in the uniball, It will only dry the rubber out over time, It will destroy the vinyl, It will cause future damage, It can add thread friction and decrease knife clamping pressure, It can and WILL cause you finishing problems, It tends to burn at high temperatures, IT WILL SEIZE THE LOCK, It doesn't last very long, It is too thin and will evaporate, It will leave a residue, It's way to gunk-y and attracts dirt!,
If you're feeling a little bored during the holiday season...
...try Googling the phrase "Do not use WD40" for a laugh.