So there do clams come from..
I didn't find this offensive nor disturbing the least bit. The storyline is a unique and somewhat amusing concept, and you managed to make everything crystal clear to me without having me need to read your edit.
The only thing I found a little disappointing was the way you drew the faces. I understand you went all the way for some sort of comic-like appearance, I'm just not too fond of it (meh, that's just my personal stupidity. Feel free to ignore this part).
Anyway, I'll be sure to check out your other animations! Um. Well. After I've seen this one again. :)
Great job!