These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Ear Worm: The opening and ending themes. The first comes with one of the most zany opening scenes ever made, also completely unrelated to anything and everything in the anime. The second with an incredibly addicting dance sketch that's just impossible to stop looking at.