At my younger brothers high school graduation reception my godparents, who were the elementary principal and high school English teacher, were discussing the relative class sizes year to year. My brother had 42 classmates after several years of 20-30 students. (Rural North Dakota)
They chatted for a bit how odd it was then kinda ended with a shrug, "interesting, I wonder why that is."
Old Norwegian bachelor farmer in the corner looks up from his coffee and says the only thing he probably said all day, "Winter of 83" and went back to his coffee.
The look on their faces as they pondered, then realized what he had said was absolutely priceless. I will never forget it.
I've since come to also understand how my and 12 other classmates October birthdays came to be.