Some of my highest-voted comments have been pure humor. A few examples, with parent comments included for context:
https://news.ycombinator.com/item?id=8690893 (86 points, and 24 for the followup comment)
https://news.ycombinator.com/item?id=6447007 (43 points)
Even this silly one-liner got 23 points:
https://news.ycombinator.com/item?id=7863205
That one won't make sense out of context, so here's the article it refers to:
http://www.newstatesman.com/business/2014/06/bizarre-secret-...
My point in sharing these is to give some examples of kinds of humor that have gone over well here. Of course as they say, "Past performance is no guarantee of future results."
