My son, the Latin student, has been known to endear himself to new Jr and Sr High School teachers by coming to the white board, red pen in hand and "helping" the teacher.  
Not every teacher appreciated his help, the GATE teacher was less than pleased.  He did not last long in her class.
One problem with teaching your child big words, he has been accused of plagiarism on several occasions 
And let me say, being the parent of a guy with a red marking pen is less than fun some days too.