@letsbetechs: I called BS. I saw a few of these videos a year ago and figured it was a prank. I have not dove into the science of it, so this is merely my speculation, the friction from pushing the object against the paint and quickly sliding it generates heat very quickly that dissipates very quickly allowing the paint to temporarily bond with the coating on your object. I'd say certain paints, objects, and surfaces with no paint, will not work very well or at all. It was certainly interesting to try. Sorry I was late to the game! #scienceiscool #pencilwalltrick #hvactechnician #letsbetechs