When Carly and Sam blow up a watermelon with an air compressor, Carly turns on the compressor (with a standard toggle switch marked "I" and "O") by flipping the compressor switch to "O". This stands for off; on is "I".
Mrs. Benson tells Spencer to be careful with the screwdriver because it is pointy. Then she tries to hand it to him, accidentally stabbing him in the hand. However the proper and safe way to hand a tool to someone else is by holding the sharp end and handing them the handle. Mrs. Benson with her obsession about safety would know the proper way to do it.