Having written a few parody songs in my day (none of them very good), I’m acutely aware of how difficult it is to maintain the rhythm & rhyme of the original while still changing enough to make the point you’re trying to get across.
If you’re in college or have gone to college, I think you’ll really appreciate what XKCD pulled off with this:
Now, if you’re not up on your Gilbert & Sullivan, that’s ok, because David Dalrymple took on the insane challenge of actually singing XKCD’s version, so all you have to do is watch, listen, and enjoy:
[YouTube direct link] (Viewer #71,393)
I liked the line quoting Terry Pratchett, “Geography’s just physics slowed with trees on top.”