If you want to hang a framed picture above your desk, do not stand on a chair with wheels. The chair might move when you learn towards the wall causing you to fall and knock over your computer monitor onto the floor. As you get up from the floor you might roll over onto the framed picture that also fell, and crack the glass. You might cut your finger on the glass and drip blood onto a letter your boss asked you to draft up. You might also be out of printer ink and unable to print another copy until you go to the store to buy ink. That is if your car isnt being repaired because someone rear ended you a few days ago.