My sister believed that if a person was "Drinking and driving." that it was any drink, not necessarily alcoholic, and the reason why people swerved was because they had a cup or a bottle in their face, and couldn't see out of the windshield properly.
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