I also get the feeling that not all of these themes are intentional, and when speaking about joke themes on a culture level (as opposed to single-author level), vast majority of them are not intended.
(you might want to click and enlarge them)
Science Not Protecting Against Lightning
Enough for today. If you're new here then you would probably like to see also the first Joke Themes. This time, I think, the themes are more like how I see them, but I will need some more examples to be properly understandable, I suppose (4x ' I ' in one sentence!). Meanwhile I shall wonder about the possibility of creating a jokemap with all things that make us laugh in it. While surely uncreatable in 'always and everywhere' scale, would be an instersting thing even with just a few jokes mapped. Now think of the possibilities between these two extremities.
Have a nice saturday evening.