When I was about 7/8, the long-running UK TV soap, Coronation Street, showed one of the elderly characters, Martha Longhurst, sip a glass of "milk stout" in the pub, take off her spectacles and promptly die with her head in her hands.
For years after, I always feared that, if an old-ish person removed their spectacles, they would be dead soon after.
A childhood belief about people

others believed things like this
- I used to believe that a street sign that read "Dead End" meant that there were dead people buried there.Anon
- I used to think that if you walked down a dead end street you would die.— holly
- I used to believe a dead end sign meant there was a graveyard at the end of the street or zombies — Still Out There
- I thought that when you went over a speedbumb it was a dead person who had been hit by a car!Anon
- When I was 4 or so I believed if you touched a dead person you'd die too.— anonymous
- I used to believe that the lower level of the George Washington Bridge in NYC was named Martha Washington— Shayne