Etymology is a small hobby of mine. Someone on one of the IRC channels I frequent was talking about Warren Zevon the other day, who was described as 'sardonic' in his songwriting perspective, and so I looked it up. I found a gem in a related entry, on the same page. This was a reference from the Online Etymology Dictionary entry for humor:
I'm still thinking about the social significance of the reference, but for something published in 1926, it seems to have relevance today.