My favorite is when someone tries to sell a vacuum for the same price that mine sold for. If I sell a machine that was cleaned and has new parts for $150, someone will post the same vacuum for the same price. Usually, they're dirty with broken parts, cuts in the cord, broken belts, and hair all over the brushroll with no bristles left.
I also laugh when they have "TESTED" in the title. All you did was plug it in and turn it on. LOL.