In the old days of 1theatrical companies, a travelling company had experienced a bad 2 week, and there was no money to pay the actors. When the actor, who played the 3 of the Ghost in „Hamlet' heard this, he promptly told the manager: “Then the ghost won't walk tonight!” As that meant that there could be no 4 that night, he was immediately paid. Ever since the 5 of salaries in the theatre is known as “the ghost is walking.”