Of all the random things that come to mind, I'm going to go with the first time I ever corrected someone's grammar. In first grade, my teacher Mrs. Scott would always say "what?" in a certain tone if someone used improper grammar. I was in class one day, and I think it was my friend Cailin who went up to Mrs. Scott and asked, "Can me and Jessica put our desks together?" I turned to Cailin and said, "what?" Tori Amos started early on the piano. Tiger Woods started early with the golf clubs. Me, I became a grammar nazi at age 6. And now I'm an editor. Go figure, huh?
Also, the most prominent memory I have of preschool is incredibly random and pointless yet still amuses me 20 years later. For some reason, I vividly remember my friend Joshua speedwalking across the room going NOM NOM NOM on a plastic hot dog.