When I was a wee one in grade school, I thought a blow job was when someone would blow into another person's ear. So did all of my friends. So one night when my parents were going to take us to the movies and let us sit with our friends so we could be "cool" and not have parents with us while they went to a grownup movie, my mom told us "Now, I don't want you to sit in the back!" I said "Yah! Cause that's where everybody is giving eachother blowjobs!"
The look on her face was truly memorable. She asked us what we thought a blow job was. When we told her, she said that wasn't it. When we asked her what it WAS then, she said we'd have to ask our dad.
The look on HIS face when we swarmed him as he got home from work yelling "Dad! Dad! What's a blowjob? Mom said you'd tell us!" was even better.
But bless the man, he managed to explain it to us without blushing too much, including the follow up questions. We all agreed that it was pretty dang gross!
A childhood belief about oral sex

others believed things like this
- when i first heard the term, "blowjob" I thought it had to do with those Blow Pop suckers — :P
- If you pull a funny face, the wind will blow and it will get stuck.Anon
- I used to think that if you didn't blow your nose and just sniffed the snot up, you head would blow up.Anon
- i used to thynk you could get pregnant by giving a blow job. i thought that waz the only type of sex.Anon
- My dad told me that when he was little, he thought the trees waved back and forth to make the wind blow.— casey
- I was told in first grade that if you fart burp and sneeze at the same time you would blow up— bob doodle