My father was very clever yet he fell for one myth, that you should not swim for at least half an hour after eating. You get stomach cramps to such a degree that you will drown. I think he made us wait an hour before we could swim again. It is nonsense.
See which way the water swirls down your plug hole? You just know it swirls the other way in the opposite hemisphere don't you. Rubbish.
Don't use aluminium saucepans. The aluminium gets into the water and will cause you to get dementia. After all these years, not even close to being proven.
I did say three myths so I can't add a fourth but let me assure you, I am not blind and I don't have hair on the palms of my hands.