"I'm sorry I gave offense. It was a headline I wrote quickly, and I thought the image of Mike Kinsley engaged in an act of violence was kind of funny because Mike is not really the violent sort, to say the least. Anyway, one person's little joke is another person's "rage of people who cannot bear to see their sacred ideals profaned," to quote McArdle... So I will hereby endeavor to avoid any future headlines that would seem to celebrate violence or conceivably endanger the physical safety of Arthur Laffer or anybody else," - Jon Chait, saying sorry for the image of Mike Kinsley "curb-stomping" Greg Mankiw.
On the other hand, here is what happened outside the Rand Paul-Jack Conway debate last night:
(Hat tip: Josh)