Why are these the details that stuck?

It's kind of amazing, the tiny things that stick in your head from elementary school.

• Math time tests (or were they timed tests?) in first grade, and the feeling of satisfaction when I finished.
  
• My short-lived and socially disastrous foray into the third-grade reading class when I was but a measly second-grader. The brain was willing, but the social skills were so weak.
• Collecting homonyms in third grade for Spelling class. My brain still adds new ones to that list.
  
• The posters in my fourth grade classroom - one for each part of speech - that spelled out the relatively uninspiring sentence, "She dribbled swiftly toward the winning basket and - slamdunk!" I still remember Her basketball jersey, white with red letters.
• The filmstrips - "A Wrinkle in Time," "Bridge to Terabithia," and of course the one where they put the boys in a separate room and taught us about our flowering womanhood. It's weird to think that at least three technology generations have come and gone since the Filmstrip Era.
• My middle-school crush on Denny Merry. I obsessed over this little runt for three years. In seventh grade, he went through a phase where he thought it was fun to hit me over the head with our giant red Social Studies book and slam my fingers in my locker. I was flattered. I called his house and hung up, um... more than once (this was before caller ID). Then he asked out Mary Miller in the middle of science class. I was crushed. I wonder whatever happened to Denny...
  
• The eight-grade health class about Natural Family Planning (it was a Catholic grade school) and that particular motion the boys made with their thumb and forefinger that to this day still evokes vaginal mucus to me.
• "Is over of" still helps me do math problems with percents and fractions. Thanks, Mrs. O'Keefe.
• In eighth grade, I won a contest at recess by belching the alphabet. Not my most shining moment.