Some kids you just can't do anything with
True, if somewhat embarrassing, story: my parents got me a World Book Encyclopedia when I was in first or second grade, and I happened upon an article that taught Mayan numerals. I thought this was really cool; so I did my next math assignment in Mayan numerals...and then was astonished when my teacher gave me a zero.
By the way...high-school teachers these days use "WTF??" as a grading comment??