I heard this joke when I was younger and the last line of it said "And my mom's f*cking the turkey" So (being very young) I thought that the mother was standing in my gramma's kitchen flipping the turkey off and cussing at it.
A childhood belief about swearing

others believed things like this
- I thought people from Turkey actually praised turkeys...Anon
- Up until I was 10 I used to believe turkey was vegetarian.Anon
- I used to think Hungary and Turkey were the same country... I have no idea where that came from...— Skylla
- I used to believe Turkey day was a Turkish holiday. Then why are we celebrating it in America?— Lecia
- I used to believe that you could quit smoking by eating cold turkey:)— Loren
- I believed that "shut up" was cussing so i said it 1 million times— Kyla