[sexobon]

A European superstition holds that spilling salt is an evil omen. One widespread explanation of the belief that it is unlucky to spill salt is that Judas Iscariot spilled the salt at the Last Supper. Leonardo da Vinci's The Last Supper depicts Judas Iscariot having knocked over a salt-cellar.

The belief of tossing a pinch of salt over your left shoulder to get rid of bad luck come from the legend that the devil is always standing behind you, and throwing salt in his eye distracts him from causing trouble.

Thanks to Judas Iscariot, spilled salt is associated with treachery and lies. If you do spill salt, a pinch thrown over your left shoulder is supposed to blind the devil waiting there.

Kosher salt might be easiest to throw over the shoulder in a pinch.