Old Wives' Tale
9 x 12

Wikipedia says it best: Old Wives' Tail is a derogatory epithet used to indicate that a supposed truth is actually a superstition or something untrue, to be ridiculed. It can be said sometimes to be a type of urban legend, said to be passed down by older women to a younger generation. Such "tales" are considered superstition, folklore or unverified claims with exaggerated and/or inaccurate details. 

Here are some of my favorites:

• Ice cream leads to nightmares.
• Toes pointed up signify low blood sugar.
• Don't swallow gum or it will stay in your stomach for seven years.
• Don't make silly faces or it will make the silly face permanent.
• Shaving makes the hair grow back thicker.
• Eating crusts (of a sandwich) makes your hair go curly/you grow hair on your chest
• The appearance of white spots on the fingernails is due to lying.