Dang, another one of my childhood favourites says or does something stupid. Another one of my childhood memories tainted forever. I can't really think about Kramer now without thinking about what Michael Richards said.
LINK
and my favourite part....

LINK
Richards subsequently apologized for his outburst, saying he lost his temper due to hecklers in the audience. He was performing a stand-up comedy routine at the Laugh Factory in West Hollywood when African American audience members interrupted his act, saying he wasn’t funny. Richards was so outraged that he responded with profanities and racial insults.
“Fifty years ago they'd have you hanging upside down with a [expletive] fork up your [expletive]. Throw his [expletive] out!”, was Richards’ reply, which is hard to explain, exasperated as he might have been. The rest of his act was pervaded by racial remarks and profanities aimed at the heckler.
This happened on Friday. On Monday, Richards had an unscheduled satellite appearance on David Letterman’s “Late Show”. He said he went into “a rage” because of the disruption and stated that he’s not a bigot.
and my favourite part....
“For me to be at a comedy club and flip out and say this [stuff], I'm deeply, deeply sorry”, the 57-year-old actor said. “I'm not a racist. That's what's so insane about this.”