Tycho from Penny Arcade writes an excellent post on communication and offense (penny-arcade.com)
Some backstory: They put out a comic in which they made a secondary joke that involved rape (you should probably read the comic, it's not necessarily ABOUT rape). Readers thought the concept was funny enough and a "Dickwolves" t-shirt was sold. Eventually, the shirt was pulled but that didn't stop criticism.
A few months of anti-rape blog members and Penny Arcade members "interacting" eventually resulted in death threats.
Original Comic: http://www.penny-arcade.com/comic/2010/8/11/
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[ 5.7 ms ] story [ 19.9 ms ] threadPenny Arcade never issued an apology as they felt they weren't obligated to, but at the same time acknowledged that there were people who were offended.
A few months of anti-rape blog members and Penny Arcade members "interacting" eventually resulted in death threats.
Original Comic: http://www.penny-arcade.com/comic/2010/8/11/
Some readers did. Some readers thought the concept was offensive, that Penny Arcade was throwing gasoline on the flames with the Dickwolves t-shirt, and that there still hasn't really been an apology.
And frankly, all of their comics are of this nature. Why someone would be offended by these 3 panels in particular and not by any of their other work is beyond me.