I overheard some girls talking in a field. One (I thought) was saying that there were red pyramids and white pyramids.
I butted in and stated quite plainly that you didn't get red pyramids - they were all yellow.
Then they told me they were talking about 'periods'.
I assume by 'white' they meant discharge - so I'm not sure who this is more embarrasing to.
A childhood belief about periods

others believed things like this
- I'm black, so as a child I used to assume that white people pooped peach the way I pooped brown.— Rick
- Remember the old Tubes song "White Punks on Dope". Thought they were singing "White Folks are Dumb"
— WailerMan - When I was in sixth grade I thought that "oral" sex meant talking about sex.— Duh
- i used to think oral sex was talking like,oh i want you and stuff of that sort......kind of like talking "sex"— merrissa
- I literally thought “oral sex” meant talking about sex until 8th grade health class.— Kai
- I used to think that the song "Just like white winged dove" by Stevie Nicks was "Just like the white window" — Julia