Here is a common sight in any office and yet so easy to correct. Electrical cords running in a walk area or where people stand, sit, or otherwise occupy. Easy fix to tape down or put a rug over it to minimize the slip/trip/fall hazard. Also helps with preventing damage to the electrical equipment and accidentally pulling the laptop off of the table.
Hazards such as this are simple to control, but cause more accidents and injuries than many other hazards. Not only are these accidents preventable, but when they do occur, they tend to be costly and have a long recovery time.