Hmm... two thoughts about old wives' tales...
FIRST THOUGHT:
At my w*rkplace there are a few people who have a superstition about the words "busy" and "slow." They believe if you say anything about the rate of business at the current time, whether you say it is really busy today or really slow today, either of those words will automatically make us busy.
Unfortunately they are wrong. Sometimes I WISH I could summon business out of thin air on a slow day by saying one of those two words. On some very slow days I have chanted "busy busy busy slow slow slow" but it never helped our flagging business that day.
The only thing I have found that actually has any effect is for me to try to get something done. If I try to take care of one of the minor tasks I do every day, we instantly get busy and I have to drop whatever I was trying to accomplish. I have witnesses that this really does happen.
SECOND THOUGHT:
I remember a comic strip I read one time.
CAT: I heard mice spread disease.
MOUSE: You believe everything you hear?
CAT: Sure do.
MOUSE: I heard if you swing a dead cat around your head at the stroke of midnight by the light of a full moon, it brings good luck.
CAT: Touche.