Getting good survey data requires that the subjects agree to take a survey before you tell them what will be surveyed. This still biases respondents, obviously, but it puts all surveys on an equal playing field.
Jokes that many members could come up with have no place on Hacker News. That's the road to devolving into a community where everyone tries to out-joke each other and the actual insightful comments get buried under the jokes. Just grin at the thought and enjoy the happiness, but don't post it. It's not that it's not funny; it's just that it is too easy a comment.