I was in 4th grade when I had this dream. I had just changed schools from my local public school, to a smaller elementary "alternative program" school.
In the dream, I was in my 4th grade classroom and there was a smell, so strong in the dream, I'm convinced I was smelling it in real life and then assigning it a reason in the dream.
In this instance, the smell was warm and acrid, like soured fruit, soaked in battery acid. It was intense and even a little sickening. In the dream, the smell was emanating from the penises of a couple of boys in the classroom. They were boys I was starting to feel the primary flutterings of a crush on.
They too were disturbed by the smell - so much so that they had stretched their rubber-tastic penises all the way up to their noses and were using their elongated phalluses to tie off their noses.
I remember the dream for the intensity of the smell, and the freakish awkwardness of seeing boys with their penises tied to their faces.
I'm assuming this dream appeared around the time of our first phys-ed classes.