Interesting fact:

These Valentines became popular during the 1870s. They were produced by cartoonists and often had a mean-spirited message written on them which insulted the recipient. The idea was that they would be the opposite of a romantic Valentine’s Day card and were often sent anonymously to people. They were sometimes the cause of trouble – and even fistfights! An example is: “You think yourself a picture, you are – a sketch in paint, you work for hours before the glass, to look what you ain’t”.