Years ago my Dad told me a story about a work colleague of his. This guy was a walking disaster area on Friday 13th - if there was something he could drop, or break, or walk into, he would.
Dad was convinced that this was only because he
expected it to happen - a self-fulfilling prophecy. So one Friday 13th everyone in their department managed to convince him that it was really only Thursday. He went for the whole day with no accidents at all - at the end of the day, they told him what day it really was.
Then he tripped over the step at the doorway on his way out!!
