Before poison pen letters, cyber-bullies, and twitter trolls, there was the 'vinegar valentine'. With the mass production of Valentine cards and inexpensive postage, the number of Valentines sent in the 1800s soared. About half of those sent in the US in the mid-1800s were of the sarcastic mocking kind. Some even suggested suicide to the recipient! Visit CrimeReads for more about this practice.