The high-school English teacher was well known for being a hard but fair grader. 

One day, Joey received a B minus on a theme paper. In hopes of bettering his grade and in the spirit of the Valentine season, he sent her an extravagant heart-shaped box of chocolates with the pre-printed inscription, "Be Mine." 

The following day, he received in return a valentine from the teacher. It read: "Thank you, but it's still Be Mine-Us."