Tiny wank
Someone posts a link to a rather violent cartoon as a "gag". Some people get pissy.

Then, someone starts sending the guy hate mail.

While I believe the OP was using bad judgement to post that kind of thing to H_R, sending a bunch of hate mail is more than a little over the top. :P Really, the guy even apologized and tried to make things right, so why the hate? :P (Though I can't say I liked his cartoon, but still...)