My high-school English teacher was well known for being a fair, but hard, grader.
One day I received a B minus on a theme paper.
In hopes of bettering my grade and in the spirit of the valentine season, I sent her an extravagant heart-shaped box of chocolates with the pre-printed inscription:
"BE MINE."
The following day, I received in return a valentine from the teacher.
It read:
"Thank you, but it's still BE MINE-US."
-- Contributed by Brad Wilcox.