I remember having an argument with my grandma because I thought "yesterday" meant "the other day" and "the other day" meant "yesterday." I'd be like "The other day we went to the store" and my grandma would be like "We did that yesterday!" and I would be like "Nuh-uh!"

I also remember my first real conversation with my little sister, she was yelling into the phone "CHICKENS ARE NOT BIRDIES!!!"