I was told as a kid that if you kept stuffing a Big Buddies (bubble gum)I would get lock jaw.
A childhood belief about chewing gum

others believed things like this
- I used to believe that if I swallowed bubble gum, a bubble gum tree would grow inside of me. — Ryan
- I used to believe that the bubble gum medicine was really made of bubble gum. i believed this until i was 16.— Shawn
- I used to believe that my parent was actually stuffing me with tissue when I cut myself.— Colleen
- I used to believe that stuffed animals had blood in them as well as stuffing. Anon
- I thought that "Doube Bubble Toil and Trouble" was "Doube Bubble, Toilet Trouble" Anon
- When I was young my mother told me that if I swallowed bubble gum, it would stick to my liver.— Barbie