http://www.slate.com/blogs/bad_astronomy/2015/02/22/simpsons_betrayed_by_the_moon.html?wpsrc=kwfacebookdt&kwp_0=57991&kwp_4=326393&kwp_1=212001
Wizards!
Heh.
I took an astronomy course in college. Great fun. Actually learned some stuff.
One of the prof's pet peeves as it were was comic strips that didn't show the proper phase of the moon. One of our assignments was to read the comics for a week or two and cut out examples of authors who both did and did not properly pay attention to these phases.
Charles Schultz, author of Peanuts, is (was) renown for accuracy in his comics - from the phase of the moon to musical notes, it was all 100% academically accurate. You could, if you wished, play any piece of music he had in his strip. And the moon always corresponded to the proper date/time.
Wizard of Id OTOH was infamous for having no clue what a proper phase of the moon looked like.
I have since failed to keep up practicing watching when the proper phase of the moon should be, but it brought back a nice memory of my astronomy prof that this guy noticed.
How do we know that the Simpson's house isn't really upside down? Oh wait. Then Homer's belly would be hanging over the top of his head.