I like good anime openings. As a child, I remember how hyped up I'd get watching the openings to my favorite animes. Whether it's foreshadowing or hook in the audience, effort goes into those presentations.
On the other hand, there are the outros, or endings, at the end of each episode. I tend to pay less attention to those pieces growing up. If I had to recall the intros and outros, I would most likely know more former than the latter.
Over the years, I started to pay more attention to those outros and surprised myself. By surprising myself, I meant they would wind up on my play list for personal pleasure.
One of my favorite outros come from the series Beelzebub. It is an action comedy, so I expected them to be high energy. This is one series where I felt the endings were much better than the openings themselves. Of course, it's a matter of opinion. Here are my two favorites from the series.
From the outro alone, it's unlikely for one to see and grasp what the anime is about. Once you know the context, it's almost a meme within the universe itself. For example, in the above video, see it as the way the character Furuichi views the girls in the show. Then, everything seems to make sense.
This ending is definitely one of my all-time favorites. It's so aesthetic and seem to have nothing to do with the actual anime. Or manga for that matter. I loved the animation and the song. The song has an undertone of sadness to it, especially if you look into the lyrics. In a way, the song tells the story of the character Kunieda in context of Oga. I figured the flashes of a glamorized Hilda were clue enough to tell the viewers a perspective.
By the way, I want to make it clear that I ship Oga and Hilda all the way.
In the above examples, the outros added dimensions to the in-universe lore. These are some of the reasons why I started pay attention to the ending of animes. They may be artists' interpretations, but they can enrich viewers' experience.
I may go back to series I have watched before and see if I could dig out some nuggets of revelation.