insulting cards, on valentine's day?

Here are some very old examples of Vinegar Valentines; the cards that one should never send to either a loved one, stranger or enemy.

"Don't sit up nights admiring yourself. The best that can be said
of you is that you might pass in a crowd. "

" Are you too stupid and senseless to know
That this sort of thing makes a sickening show
About spooning in private I've nothing to say,
But to do it in public proclaims you a jay."