At the school where I teach, there are two parts to the final class grade: academic and citizenship. Most of the time citizenship is a non issue, but when you combine the two, you can get some interesting grades headed home to parents.
Academic grades (very standard)
A=Excellent
B=Very good
C=Average
D=Below average
F=Fail
Citizenship
O=Outstanding
S=Satisfactory
N=Needs improvement
U=Unsatisfactory
I realized the combination factor one day as I was reviewing my students grades and saw that I had given one of my students, an epic fail if every there was one, the grade of "F U." I started to feel badly about saying "F U" to this student and his parents, until I decided that it was what the student had earned and it was really how I felt.
To this day, I can still give the grade of "F U" along with other fun ones like "B S" and "B O."