I never understood the reason for chucking salt over your left shoulder to undo the bad luck of spilling it on the table in the firstplace. Now I’m a little wiser. Salt is very affordable now but in ancient times it was rare and was a precious commodity and was used as a form of currency. So if you spilled it you were chucking your money about carelessly which was considered bad luck in those days. The devil gets the blame for your carelessness and as he sits on your left shoulder a pinch of salt was one way of blinding him. This clever move will prevent him from tricking you into spilling any more salt about the table.