Many times when 8th grade students don't know how to spell a word, they will give it their best shot, right click on the misspelled word, then choose the first option on the list without a thought. As a result, I often get sentences like this one, from an 8th grader's autobiography:
"It was a good year, both fiscally and mentally."
Pretty sure he meant physically. How was he to know it didn't start with an "f"?