"There are no moral or immoral jokes. A joke is either funny or it is not. That is all."

Jim Holt — author of "Stop Me If You've Heard This: A History and Philosophy of Jokes" — states a proposition (and debates it with Will Wilkinson whose immediate response is: "Can't possibly be true").

That joke Earl Butz told just wasn't funny?

Sarah Silverman's "the Holocaust isn't always funny" is funny?