Deception

Deception is something that magicians rely on quite heavily.  Here's another example:
One Friday night, a worker approached the guard shack with a wheelbarrow full of hay.  He stopped while the guard searched the hay.  Finding nothing, he let the worker go home.  That went on for several Fridays, the guard knowing the worker was stealing something, never finding anything in the hay, but just couldn't figure it out.  Finally, the guard stopped the worker and told him he knew he was stealing something, that it was driving him crazy and that he was being transferred to another city.  He begged the worker to tell him, promising not to tell anyone else, just what it was he was stealing.  The worker said "wheelbarrows".