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.” 

One Liner
Q. What did the boy pickle say to the girl pickle on Valentine’s Day? 
A. You mean a great dill to me!