Some time about 1980 I saw a public information film advising people not to drink and drive. This made perfect (and obvious) sense to my three-year-old brain, as your coffee might distract you from the road.
A childhood belief about cars

you weren't the only one
80 of you believed this
- I used to belive that it was Illeagal to drink ANY beverage while driving, not just alcohol.— Emma*
- I used to think that the dangers of drinking and driving included soda, juice, milk, or water.— Rick
- Don't drink and drive! Literally. I would fuss at the driver if they had so much as a coke in their hand.
— Élistariel