In Japan, there exists a very unique soda called Ramune, that requires you to push a marble down into the drink in order to carbonate it. I'm sure some of you have heard of this, but what you probably don't know is that there is now an anime "based" on this soda.
I found episode 9 here, but be warned that it's a little disturbing.
Here are a few pics from the show, and I will leave you to make your own judement.
The last one is the eyecatch, btw. For some reason that fish appears everywhere in the show.